Can A Dating Scan Be Wrong By 4 Weeks

Wrong due date from ultrasound scan - why it happens . . .
How inaccurate can dating scans be? - Netmums
Can dating scans be wrong? - Netmums
Fact Sheet Ultrasound in early pregnancy (before 12 weeks . . .
Dating scan - BabyCenter Canada
Can scan dates be wrong ? | BabyCentre
Dating scan | Pregnancy Birth and Baby
can early pregnancy scans get dates wrong? | Mumsnet
Did anyone have a date change at 12 week scan from early . . .
anyone had a scan at 4 weeks?? | Mumsnet
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We always recommend mums get a definitive dating scan closer to 12 weeks as this will be much more accurate ." WoW babies confirms that it's worth the wait for the 12 week scan . "Definitely agree that dates from early scans are not accurate . Just half a millimetre at such an early stage can change your date by a week .
I saw sure my dates were wrong by about four weeks , I have an implant in when I fell pregnant and had only had sex once . At my twenty week scan they took measurement of baby and they corresponded with me been 23 +5 but they refused to change me EDD and said dating scan would have been more accurate .
i think they can be a week either way matey . they date them by 'size' as on an aveerage until a baby gets to 20 weeks they all develop at a simalr rate . very early scans can be a few weeks unaccurate as the baby is so tiny but 12 week scans are normally quite accurate but obviously they can be a few days out either way . some ppl are adament they know what day they concieved e .g they may have only had sex 1 time in the month so in theory you think you wud be able to pin point the day that you . . .
we can also combine the scan with a risk calculation for Down syndrome and other chromosomal (gene) abnormalities using the nuchal translucency (NT) screening . However, some women do need a scan before 12 weeks . Between 8 - 12 weeks of pregnancy is a good time for a dating scan . A 2-D image of a baby at about 8-9 weeks . Small arms are becoming visible, sticking out slightly in the middle of the baby .
So if there's uncertainty, and the scan date differs from your period dates, the scan date will be used . Pregnancy weeks are counted from the first day of your last menstrual period (LMP) . But that won't tell you when you actually conceived . Conception usually occurs around 14 days after your LMP, which is when you ovulate (Mongelli 2016) . If your cycle is irregular, or you've recently been on the pill, working out your due date from your LMP probably won't work .
Yes they can be wrong , early scans can be up to 2 weeks out either way . If baby is smaller/bigger than average then the dates they are telling you may be wrong . By my dates I was due 14th Oct but MW's and scans kept saying 20th but as I was charting and knew when I ovulated etc and the 14th was my due date even before I Had my BFP .
A dating scan might be recommended before 12 weeks to confirm your due date if you are unsure of your last menstrual period or your date of conception . The scan is optional and not everyone will have it . You can discuss whether you want or need a dating scan with your doctor or midwife . A dating scan is usually done to check how many weeks' pregnant you are, but can be done for other reasons, such as if you have had bleeding during your pregnancy or you have had previous miscarriages .
Congratulations . Well when I had an early scan I would have said I was about 8 weeks but they said just 7 after early scan . When I went for my 12 week scan they said then that I was more like 13 weeks and moved my date forward again in line with my original thoughts . They said at my 12 week scan its a much more accurate date wise than an early . . .
My two early scans (6 weeks and 8 weeks ) both gave me a date of 6th April . My 12 week scan put me forward 6 days, which if correct would mean that my 6 week scan was really 7 weeks yet only a gestational sac and 4mm yolk sac was seen . I also had two early scans with my daughter and again the 12 week scan moved me forward ( by a week last time!) .
Now i had a 2 week wait from my scan (1 week left) witch works out i will be 6 weeks from ovulation when they are to expect to see anything, as soon as they do i can be confirm as 8 weeks pregnant and my 12 week scan will confirm dates better I hope this helps you better, as your HCG is fine to me and i believe you Just having the same as my self .
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Can A Dating Scan Be Wrong By 4 Weeks