A member asked:

By crl i was told im 22w3d. the extra 2wks are already added? if sex occured approx 23 wks ago with x. he cannot be the father since fetus is 20w3d?

A doctor has provided 1 answer

That depends: How early did you get your earliest ultrasound? If it was in the first 12 weeks, then the possible error is no more than 4 days+/-. If it was later, the ultrasound size may be off by a little more. We count from the last menstrual period because in the past we did not have ultrasound and the period was the only landmark we had to go on to date a pregnancy. Was there another partner?

Answered 4/25/2015

3.7k views

Thank

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