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The date of conception can't actually be determined, but the fetal growth usually reflects how far along the mother to be is , so i believe an ultrasound is pretty accurate.

It depends when in the pregnancy it is done. The earlier in pregnancy the more accurate it is. So at 7 weeks it is only going to be inaccurate by 3 or 4 days.

If you have your first U/s at 8 months it is not nearly as accurate as babies vary so much in size.

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โˆ™ 2015-07-15 21:35:34
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Q: Can an ultrasound scan be wrong by a month?
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