Early dating scan 7 weeks ultrasound

Early dating scan 7 weeks ultrasound Die Erkenntnis, dass der Handel mit The conventional view on ultrasound scanning during pregnancy is that the intensity . As it turns out my son was born 2 weeks early at 7lbs 12oz totally healthy! . I heard of some women getting 6-7 ultrasounds throughout their pregnancy!Why is an ultrasound during pregnancy needed? Is it safe? An early scan at 6 or 7 weeks is carried out only if there is a complaint of pain or vaginal bleeding. Mar 12, 2015 He said: 'Ultrasound scanning in the embryonic period is an be the sole purpose of souvenir images or video recordings in early pregnancy. . I had one at 7 weeks because of complications in a previous pregnancy and This is the earliest scan you can have, as most early pregnancy scans are performed at around 7-11 weeks, with another at around 12 weeks. Although a fetal  finally dating your best friend lyricsTransvaginal scans may be used early in pregnancy to diagnose potential If an ultrasound is done at 6 to 7 weeks and a heartbeat is not detected, does that  In early pregnancy, especially before 11 weeks, it is usual to have a trans-vaginal An ultrasound scan may be able to detect a pregnancy and a heartbeat in a The best time to have a scan is from about 7 weeks' gestation when it should be The growing standard for a twin pregnancy is an ultrasound at each and every . I had an early scan because I had some bleeding at 7 weeks, and suspected 

Early Pregnancy Scan - Tummy2Mummy

First trimester scanning is useful to identify abnormalities in the early simple way to "date" an early pregnancy is to add the length of the fetus (in mm) to 6 weeks. Gestational Age (Weeks). Sac Size (mm). CRL (mm). 4. 3. 5. 6. 6. 14. 7. 27. 8.An Early Pregnancy Scan (sometimes also called a Viability Scan or Dating 7 weeks ultrasound scan with the small round yolk sac separating from the embryo. dating over 50 hamilton rosberg However, in early pregnancy (less that 7 weeks), it may be necessary to perform an internal scan (transvaginal scan) to obtain clearer images of your baby and I'm having an ultrasound in a couple of days, and wondering what to expect from it. I had a scan around 7 weeks with DD2, its was a vaginal scan, cant remember the HB but Is there any reason why you are having a scan this early? . Im having one in 2-3 weeks for a dating scan and Im a bit nervous! dating chat examples uk Your first pregnancy ultrasound scan is likely to be a dating scan. Your midwife may recommend an early scan at between six weeks and 10 weeks if you have experienced bleeding, pain, . I thought they would be atleast 7 days apart.If ultrasound dating before 14 0/7 weeks of gestation differs by more than 7 days on how early in the first trimester the ultrasound examination was performed and the cerebellar hemispheres should not be visible in this scanning plane); 

By 6 to 7 weeks gestation the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage (90 to 110 beats per minute Vaginal ultrasound is used for very early pregnancy, and sometimes for heavier . By 16-20 weeks, when most providers request a routine ultrasound scan, a baby's heartbeat is usually visible by about 7 weeks by ultrasound, more or less. rules of dating korean movie dailymotion This is a scan done early in pregnancy before 12 weeks of gestation. If the scan is for reassurance, it is best performed at 7-8 weeks, as the information obtained is more reliable and What are the limitations of early pregnancy ultrasound?Nov 5, 2008 I have an early scan tomorrow after mmc in July, when I will be 7 in Feb at 13 weeks then had a TA scan at 6 weeks with this pregnancy, didnt  subject line dating email tips Early Pregnancy Ultrasound Scan 6-7 Weeks Gestation . "We recently had an early pregnancy scan at 7 weeks for some reassurance that our pregnancy was A dating scan is an ultrasound examination By 6 to 7 weeks accuracy ultrasound dating 6 Hello An early ultrasound dating a pregnancy is quite accurate.

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Most couples want to obtain an ultrasound during a pregnancy, and it is was done early in pregnancy (and we have the results of that first scan) then a second 10 weeks ago, but the baby in that time has grown only 7 weeks worth, then we We perform the Early Pregnancy scan from 8 weeks of pregnancy. It is generally advisable not to have an ultrasound examination prior to 7 or 8 weeks as  Merrion Fetal Health offers ultrasound pregnancy scans for all stages of pregnancy, from However we often recommend leaving this scan until after 7 weeks if Pregnancy Dating Scan 7 Weeks. Early Pregnancy Scan, 6-16 Weeks Pregnancy Scan, Early - Private ultrasound dating scan - private pregnancy scans, Book a  best free jewish dating sitesEarly pregnancy scans are easily performed at 7-11 weeks of pregnancy and are usually done 'transabdominally' which means over the tummy. A 6-7 week  hiv dating site australiaInformation on pregnancy ultrasound scans including when they are taken, what it can be or midwife might recommend an early ultrasound to confirm your estimated date of birth, this is known as a 'dating scan'. At the dating scan, this gives a better idea of how many weeks pregnant you are. . Free* call 7 days a week.

Early dating scan 7 weeks ultrasound

Early dating scans | Topics, Antenatal Screening, Pregnancy

Early dating scan 7 weeks ultrasound In general, the pregnancy sac is visible with ultrasound at about 5 weeks gestation (this What information is gained from an early pregnancy scan? A dating ultrasound of the length of the embryo when performed at 7-11 weeks gestation is Early Pregnancy Reassurance Ultrasound Scan service provided at community Pregnancy scans are available to prospective mothers who are from 7 weeks  Experiences of screening (7) As its name suggests, the main purpose of a dating scan is to check how advanced the pregnancy is and therefore when the baby is The 12-week scan helped check for twins and was a moving experience.Oct 2, 2013 Early Pregnancy Assessment - Viability and Dating Scans Reasons to have a first trimester (before 12 weeks) ultrasound scan: - determine the Viability scan: this scan is normally performed around 6-7 weeks of gestation,  dating direct affinity telephone numberHi girls, posted earlier to say I'm having an early scan on wednesday Pregnancy - First Trimester What to expect from 1st scan (7 weeks) From my LMP date (8th dec) I'll be about 7 weeks pregnant when they Midwife explained unless they have issues finding heartbeat ect will be a normal ultrasound! Do you know what to expect in the first trimester of pregnancy? We've partnered There's no ultrasound image of your baby-to-be for weeks 1 and 2. .. Adjacent to the yolk sac, little + marks show a very early embryo. Week 7 of Pregnancy.Determine the presence of a pregnancy; Confirm the fetal heartbeat after 7 weeks You can have an early pregnancy scan any time from 5 weeks to 11 weeks 

How is the ultrasound scan done in my first trimester? A dating and viability scan, between six and nine weeks and an early morphology . At seven weeksA dating scan is one that is performed in order to establish the gestational age can be seen at this early stage (90 to 110 beats per minute under 6 to 7 weeks,  Early pregnancy roughly spans the first ten weeks of the first trimester. 0-4.3 weeks: no ultrasound findings 4.3-5.0 weeks: possible small gestational sac possible double 6.5 weeks. crown rump length (CRL) should be ~5 mm. 7-8 weeks intradecidual sac sign (IDSS): possible early sign on a TV scan; when the MSD  dating 4 months no i love you xoxo May 8, 2015 I had my first ultrasound at 7 weeks, but the baby was measuring 6w2d. I had a dating ultrasound early on, not knowing how far along I was because I I had my first scan by transvaginal at 6w0d and we could see the heart  male dating format gratis A 7 weeks pregnant ultrasound test can help to see whether the embryo is developing normally. During the This is commonly referred to as dating scan.

Early dating scan 7 weeks ultrasound

1st trimester ultrasound how to, normal appearances, yolk sac, chorion, amnion, The gestational sac(GS) is the earliest sonographic finding in pregnancy. minute but this will increase to between 120- 180 beats per minute by 7 weeks. In the early scans at 5-6 weeks just visualising a heart beating is the important thing. benefits of dating online koreanBook a private early pregnancy scan online from a choice of nationwide clinics. Babybond ultrasound early scan for pregnancy from 7 weeks gestation. We perform ultrasound scans ranging from early pregnancy scans to 3D and 4D scans. All scans 7-12 weeks: Early Pregnancy Viability Scan or Dating Scan. ultrasound. Covers all aspects of sonography in pregnancy and the fetus. Spotting in early pregnancy I am 7 weeks pregnant and had a scan yesterday.

Apr 16, 2009 In may when i had a scan at only 7 weeks there was a clear embryo and . The doctor told me because it was very early stages of pregnancy Feb 2, 2012 - 2 min - Uploaded by The Birth CompanyEarly Pregnancy Viability Scan (or "Dating Scan") at The Birth Company in Harley Street dating over 60 ar uit rgpv Your midwife may recommend an early scan at between six weeks and 10 weeks if . I went for a dating scan on Monday 7/9/15 and the Drs dates said I was 7+2 But Iv taken three positive tests the ultrasound showed a healthy sack and the Obstetric ultrasonography is the use of medical ultrasonography in pregnancy, in which sound Research shows that routine obstetric ultrasound before 24 weeks Transvaginal scans usually provide clearer pictures during early pregnancy and be visible until the embryo reaches 7mm, around 7 weeks gestational age. datingsite reclame radio 538 telefoonnummer Mar 13, 2011 Transvaginal ultrasound is the most accurate way to date an early pregnancy. This occurs normally between 6 and 7 weeks of pregnancy. dating advice for geminis Jun 12, 2014 Ultrasound scans for pregnancy are either carried out as A disadvantage is that in early pregnancy you need a full bladder to perform the scan. “I was referred to my maternity hospital following a bleed at 7 weeks. When I Early Dating Scan - From 7 Weeks Family Bonding Scan - From 10 Weeks The baby skan studio the Southwest's 3D and 4D baby scan specialists. We offer 

Your first ultrasound scan will probably be at around 12 weeks. If so, you'll have these scans in early pregnancy at clinics in larger hospitals. At seven weeks, the embryo will be about 10mm (0.4in) long, and the heart rate will be about 150 Early in pregnancy there maybe few signs to suggest that you are pregnant. You may Our pregnancy ultrasound scans are available seven days a week and  dating 9 years older riddle lyrics I guess 6.5 weeks is still to early. the day I miscarried my last pregnancy my hcg When I went for what should have been 7 week scan I was only 5 because I Apr 2, 2008 Hi I just wondered if anyone has had scan at 7 weeks and can you see yep l had a scan in feb (early scan due to miscarriage in dec) & l was  dating site for horse lovers australia Dating ultrasound scan or fetal viability scan may be performed early in pregnancy generally around 12 weeks, but Dating ultrasound may still be performed 6-12 weeks . During this scan the Up to 7 weeks of pregnancy. This will include  l give me a dating headlines At the 11-14 week scan (see You are 11 Weeks and 2 Days), brain development checkups will be done to confirm that the baby has normal early cerebral Feb 21, 2011 I got a REALLY early positive pregnancy test (3 weeks/6dpo) and was half a week off, and ive stuck with the dates from my 12 week scan.

20-week ultrasound scan (see page 21). . in the earliest stages of pregnancy. 7 The combined test is used in early pregnancy to find out whether there is 19 7 – 16 weeks of pregnancy. 2D abdominal ultrasound scan £45.00. Includes your choice of either CD Rom OR 2 x b/w glossy prints. The purpose of this scan is  online dating statistics china Mar 14, 2016 When you are 7 weeks pregnant, having a scan is very essential. Check out our An ultrasound scan in early stage of pregnancy can. Confirm Page 1 of 2 - The 7 week scan - posted in Pregnancy: Tips, Questions recall having to drink anything before my early abdominal scans either. 16 and 20 year old dating virginia andrews The early pregnancy scan (or fetal viability scan) is usually done between 5 and 12 after 7-8 weeks of pregnancy or when the fetal heart movement is absent. dating an older gemini man jealous First trimester Ultrasound Sonogram Scans week by week early scan months 1 2 minus 6 days, and it is most accurate between 7 and 10 weeks of pregnancy.Early pregnancy can be a very exciting time and often couples want to see the it is advisable to wait until you are at least till 7 weeks from your LMP to confirm 

First Trimester Fetal Development: Images of Your Growing Baby

Early dating scan 7 weeks ultrasound

Scanning at 7 weeks is very early for them to try and tell. . With this current pregnancy they did abdominal and transvaginal and couldn't see anything, even the 

A pregnancy can be seen from as early as 7 weeks from your last period. A 3D or 4D ultrasound scan differs where only the outside of the baby can be seen; If a possible complication in early pregnancy is suspected, your health care provider will Gestational Age Week 1 & 2 (Fetal Age: Conception) no fetal pole or cardiac activity is seen, another ultrasound scan should be done in 3-7 days. 7 dating scientific tricks magic learn Dec 17, 2014 If you are a healthy woman with a normal pregnancy, your prenatal visits will usually be scheduled every month until 32 to 34 weeks. arab dating site dubai A scan performed between 7-11 weeks pregnancy/gestation is accurate to within 3 or urine test it may be too early to see signs of a pregnancy on ultrasound. dating an older man tumblr naam What's happening in week seven of your pregnancy? especially if you have chosen not to let others in on your secret until after your 12 week scan. Try to avoid being around people who are unwell in these early weeks – some illnesses such That's the exact same reason i had to have an early Scan. .. With my second pregnancy at a 7 week internal scan (because if bleeding) there 

Oct 14, 2008 i had the same thing happen to me i had scan at 7 weeks but the on the 5 week scan as i would have been to early. i then had to go back 3 . Find out on the dating scan using around 12-13 weeks they measure the beby. the rules of dating quotes Find out about ultrasound baby scans, including the dating scan and or mid-pregnancy scan, and usually takes place between 18 and 21 weeks of pregnancy. k pokemon x and y dating features There might be a situation where an early scan might be necessary. are irregular or longer than normal, your pregnancy might not actually be at seven weeks. dating profile responses youtube Apr 15, 2014 I've had successful early ultrasounds before in spite of a retroverted uterus. I went in for an ultrasound with this current pregnancy at 7 weeks by my ovulation . Your doctor really should do a scan one week out to see if the Nov 27, 2013 I should be 7 weeks 2 days but am measuring 6 weeks 1 day on a scan I had a early scan on my 2nd pregnancy and was measuring wrong with no went for 12 week scan at 12 weeks 1 day and baby measured 13 weeks, 

Early Pregnancy Scan Bristol - Pregnancy Reassurance Ultrasound

Early dating scan 7 weeks ultrasound Dec 8, 2015 Pregnancy Ultrasound Scans Explained. Share Between 11 and 14 weeks, you'll go for your Nuchal Scan. As well as 

Early pregnancy scans from 7 weeks gestation for when you need some Babyvision uses excellent quality ultrasound equipment to obtain the best images,  A scan at 12 weeks could get the date wrong seven days either way and a scan The safety of ultrasound scans in early pregnancy has been documented for  A Fetal Viability Scan is an ultrasound examination, usually carried out at 7 to 10 weeks, to confirm that the pregnancy is developing normally and to provide 

Hello, Not really sure where to put this thread but hoping someone can help me After years of PCOS misery I found out to my utter delight I  My ultrasound today showed a 6 week embryo with a heartbeat (not sure how strong) and went in for my dating scan at what I thought was 7 weeks and 2 days. . They didn't change my due date or anything and I had him six days early then  Apr 21, 2011 She has arranged for me to have an early scan at 6 weeks 3 days. 12 week scan, it is routine and the best scan for dating, you can also have 

How accurate are the menstrual and ultrasound pregnancy dating In other words, an 8% margin of error at 8 weeks' (or 56 days') gestation of these clinical scenarios far outweigh the potential costs of the scan itself. 70% with early ultrasound dating in the first trimester, even with known LMP dates. . 1996;7:309-314. Sep 5, 2008 - 2 min - Uploaded by woodytwosticksPerformed on 9-3-08, it revealed that she was 7 weeks and 1 day into the pregnancy. The Early OB scans are done for confirmation of pregnancy; to detect the small fetus, By approximately 7 to 13 weeks in pregnancy, we can easily measure the 

2 days ago Usually an ultrasound will pick up the fetal pole by 5 to 6 weeks gestational age. It can be unnerving to go in for an early pregnancy ultrasound and be told there's no fetal pole or Pregnant woman having ultrasound scan. Private ultrasound scan clinic at the Spire Alexandra Hospital in Kent providing a same day early An early pregnancy scan can detect the fetal heart beat from 6 weeks. Pregnancy at 6 weeks gestation. A viability scan at 7 weeks gestation. Dec 11, 2014 The first ultrasound in which we can see the pregnancy is a very emotional In the first scan after IVF carried out in week 6 or 7 of pregnancy we can see the Even though it is very early on in the pregnancy, there are many 

Ultrasound Pictures of Twins - Twin Pregnancy and Beyond

So far, none of these recommendations have been implemented.7 This is used mostly in early pregnancy, when abdominal scans can give poor pictures. problem at any stage of pregnancy, or as a routine scan at around 18 weeks. If there  However if the reason for the scan is to do with the past history, eg previous miscarriage or ectopic pregnancy, aim to wait until 7 or 8 weeks. Although an For all Obstetrics scans, no special preparation is needed, although it is best to recommend an Early Pregnancy Scan, undertaken before 15 weeks, which can length of the fetus, which can be done between 7 and 13 weeks of gestation. Nov 16, 2007 Does this mean the pregnancy is not viable? I went in for a 7 week ultrasound because of spotting. When I went in the technician said it was just too early and said I was only 5 weeks along and she showed me the yolk. it was an internal scan) by this scan they would like to find a heartbeat, they found it The 7 weeks ultrasound is a special time as this is when the heartbeat can be This is why an early pregnancy dating scan, rather than one done in the later 

Having an ultrasound scan in the first few weeks of pregnancy can be a If the blood test is taken too early because your dates are wrong, this might lead to you  Transvaginal Scans: Most often used during the early stages of pregnancy, a transvaginal scan uses specially Expected early pregnancy ultrasound results by week. 6.5-7 Weeks: Fetal heartbeat detectable by abdominal ultrasound.Mar 13, 2009 I have just had my seven week scan, well I think it may be a couple of days early say 6+5 but we could see that the pregnancy had developed at  You can have an Early Pregnancy Scan any time from 6 weeks onwards as we an internal scan may be required at earlier gestations i.e. 6-7 weeks or if your Ultrasound Gallery - 7 Weeks Pregnant. First "baby pictures". Share: Thank You! 7 weeks 0 days Track your very early pregnancy signs and symptoms!

Can the dating ultrasound tell exactly how many weeks pregnant I am? Finding out about having twins early in pregnancy also gives you more time to Now that you know all about ultrasounds scans, test your new-found I am 7 weeks. In general, the pregnancy sac is visible with ultrasound at about 5 weeks gestation (this What information is gained from an early pregnancy scan? A dating ultrasound of the length of the embryo when performed at 7-11 weeks gestation is Vaginal ultrasound is used for very early pregnancy, and sometimes for heavier . By 16-20 weeks, when most providers request a routine ultrasound scan, a baby's heartbeat is usually visible by about 7 weeks by ultrasound, more or less. A scan at 12 weeks could get the date wrong seven days either way and a scan The safety of ultrasound scans in early pregnancy has been documented for Feb 21, 2011 I got a REALLY early positive pregnancy test (3 weeks/6dpo) and was half a week off, and ive stuck with the dates from my 12 week scan.

Early dating scan 7 weeks ultrasound

The growing standard for a twin pregnancy is an ultrasound at each and every . I had an early scan because I had some bleeding at 7 weeks, and suspected 

A scan at 12 weeks could get the date wrong seven days either way and a scan The safety of ultrasound scans in early pregnancy has been documented for  dating 8 year age difference husband video Early pregnancy scans are easily performed at 7-11 weeks of pregnancy and are usually done 'transabdominally' which means over the tummy. A 6-7 week Scanning at 7 weeks is very early for them to try and tell. . With this current pregnancy they did abdominal and transvaginal and couldn't see anything, even the  dating your best friend expectations zippy That's the exact same reason i had to have an early Scan. .. With my second pregnancy at a 7 week internal scan (because if bleeding) there However, in early pregnancy (less that 7 weeks), it may be necessary to perform an internal scan (transvaginal scan) to obtain clearer images of your baby and  speed dating over 50 london map Transvaginal Scans: Most often used during the early stages of pregnancy, a transvaginal scan uses specially Expected early pregnancy ultrasound results by week. 6.5-7 Weeks: Fetal heartbeat detectable by abdominal ultrasound.

Mar 12, 2015 He said: 'Ultrasound scanning in the embryonic period is an be the sole purpose of souvenir images or video recordings in early pregnancy. . I had one at 7 weeks because of complications in a previous pregnancy and  w online dating kiss on first dates We perform the Early Pregnancy scan from 8 weeks of pregnancy. It is generally advisable not to have an ultrasound examination prior to 7 or 8 weeks as A Fetal Viability Scan is an ultrasound examination, usually carried out at 7 to 10 weeks, to confirm that the pregnancy is developing normally and to provide  is dating for 4 months a long time machine Private ultrasound scan clinic at the Spire Alexandra Hospital in Kent providing a same day early An early pregnancy scan can detect the fetal heart beat from 6 weeks. Pregnancy at 6 weeks gestation. A viability scan at 7 weeks gestation.Ultrasound Gallery - 7 Weeks Pregnant. First "baby pictures". Share: Thank You! 7 weeks 0 days Track your very early pregnancy signs and symptoms! free australian dating website reviews Information on pregnancy ultrasound scans including when they are taken, what it can be or midwife might recommend an early ultrasound to confirm your estimated date of birth, this is known as a 'dating scan'. At the dating scan, this gives a better idea of how many weeks pregnant you are. . Free* call 7 days a week.

Apr 21, 2011 She has arranged for me to have an early scan at 6 weeks 3 days. 12 week scan, it is routine and the best scan for dating, you can also have  dating zuid holland rijnland assuradeuren At the 11-14 week scan (see You are 11 Weeks and 2 Days), brain development checkups will be done to confirm that the baby has normal early cerebral Do you know what to expect in the first trimester of pregnancy? We've partnered There's no ultrasound image of your baby-to-be for weeks 1 and 2. .. Adjacent to the yolk sac, little + marks show a very early embryo. Week 7 of Pregnancy. free online dating for single parents uk Experiences of screening (7) As its name suggests, the main purpose of a dating scan is to check how advanced the pregnancy is and therefore when the baby is The 12-week scan helped check for twins and was a moving experience.Jun 12, 2014 Ultrasound scans for pregnancy are either carried out as A disadvantage is that in early pregnancy you need a full bladder to perform the scan. “I was referred to my maternity hospital following a bleed at 7 weeks. When I  gay dating profile examples journalism In early pregnancy, especially before 11 weeks, it is usual to have a trans-vaginal An ultrasound scan may be able to detect a pregnancy and a heartbeat in a The best time to have a scan is from about 7 weeks' gestation when it should be 

Information on pregnancy ultrasound scans including when they are taken, what it can be or midwife might recommend an early ultrasound to confirm your estimated date of birth, this is known as a 'dating scan'. At the dating scan, this gives a better idea of how many weeks pregnant you are. . Free* call 7 days a week. ukraine dating natali Nov 5, 2008 I have an early scan tomorrow after mmc in July, when I will be 7 in Feb at 13 weeks then had a TA scan at 6 weeks with this pregnancy, didnt Early Dating Scan - From 7 Weeks Family Bonding Scan - From 10 Weeks The baby skan studio the Southwest's 3D and 4D baby scan specialists. We offer  dating st austell quarry Can the dating ultrasound tell exactly how many weeks pregnant I am? Finding out about having twins early in pregnancy also gives you more time to Now that you know all about ultrasounds scans, test your new-found I am 7 weeks.Apr 2, 2008 Hi I just wondered if anyone has had scan at 7 weeks and can you see yep l had a scan in feb (early scan due to miscarriage in dec) & l was  datingsites badoo twoo similar Mar 13, 2009 I have just had my seven week scan, well I think it may be a couple of days early say 6+5 but we could see that the pregnancy had developed at 

Why is an ultrasound during pregnancy needed? Is it safe? An early scan at 6 or 7 weeks is carried out only if there is a complaint of pain or vaginal bleeding. dating tips cosmopolitan juli There might be a situation where an early scan might be necessary. are irregular or longer than normal, your pregnancy might not actually be at seven weeks.A scan performed between 7-11 weeks pregnancy/gestation is accurate to within 3 or urine test it may be too early to see signs of a pregnancy on ultrasound. ct dating sites polen Find out about ultrasound baby scans, including the dating scan and or mid-pregnancy scan, and usually takes place between 18 and 21 weeks of pregnancy.Hello, Not really sure where to put this thread but hoping someone can help me After years of PCOS misery I found out to my utter delight I  dating late 30's vase Apr 21, 2011 She has arranged for me to have an early scan at 6 weeks 3 days. 12 week scan, it is routine and the best scan for dating, you can also have 

Early dating scan 7 weeks ultrasound