How are you dated: An edd is not precise, however there is typically not very much error. In the first trimester ultrasound dating has a 1 week range. In the second trimester, ultrasound dating should not be off by more than 10-14 days. So you should not be "much later" than 20 weeks.
Answered 5/30/2013
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A doctor has provided 1 answer
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