How accurate are dating scans at 14 weeks

) 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 under 6 to 7 weeks, then 110 to 200 beats per minute as the baby matures).

the baby and its heart beat can be detected relatively easily with trans-abdominal and trans-vaginal examination.

how accurate are dating scans at 14 weeks-24how accurate are dating scans at 14 weeks-81

so although I'm sure very occasionally it's not right, I really think in your case it most likely is.

I would have though that the scan is more reliable than an ovulation test to be honest, there will be some variation as as mentioned previously they are measuring size and there is bound to be some individual variation.

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I know to within 4 hours when we conceived, because it's an IVF/ICSI pregnancy.

This is my scan history: 7 3 - measured 7 3 9 0 - measured 9 0 11 3 - measured 11 2 13 0 - measured 13 2 So you can see it was pretty tight - but still a bit variable.The earlier the ultrasound is done, the more accurate it is at estimating the baby's due date.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.For example if you a tiny sac can be seen in the uterus, but the baby and its heart beat may not be detected yet.

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