How accurate are dating scans at 14 weeks

When I was dated 11 2, I actually saw them take two measurements - 11 1 and 11 3 - so they obviously just split the difference!So it's not exact - but that said, if you were scanned before 12 weeks, I would be very surprised if they were as far out as 3 weeks! You had sex that ties in with the date they gave...I would have thought 3 weeks out was unlikely, but I guess baby will arrive when it's good and ready. I suppose I leave my calculations aside for while...least until my 20 week scan!!My cycle was 38/39 days so it was quite difficult to determine.My GP thought at first that I was 6 weeks preg and than my scan cut the two weeks off so all a bit confusing!!!But yet again m,any thanks for all your comments and good luck to all of you!!

Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy.

I was charting my temperature and other ovulation indicators so I thought I knew when I conceived but all 3 scans so far have come out with similar dates to each other but different to my calculated date, they are using their dates so I am too !!

Apparently if there is only around 5 days difference between the date from your lmp and the dating scan they just leave it as is.

Ask your midwife about the way the dating has been worked out.

My first scan dated me at 11weeks 5 when I KNEW I could only be 9 weeks!

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