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At 7 weeks an ultrasound is accurate within 2 or 3 days. At 20 weeks it is accurate within 5-7 days.

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โˆ™ 2006-03-05 00:12:21
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Q: How accurate are ultrasounds in determining when you conceived?
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If your due date is September 25 when was the baby conceived?

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I have a friend?

what was her age anyways?? One thing you need to realise with ultrasounds and determining the age of the fetus is the size of the fetus. Either their dates are correct and your friend fell pregnant after the 15th or she fell pregnant around the 15th and the size of the fetus is a little smaller than average at that age and they are going by that. Get me? ultrasounds are not accurate, especially very early in the pregnancy. So they are saying she fell pregnant around sept 28 because of the size of the fetus and the average a fetus is at that age. Hope this helps.

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