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A member asked:

I am 10 weeks pregnant today and my u/s tech said i should only be 9 weeks. is it possible that since i knew the days i was ovulating that i'm right?

A doctor has provided 1 answer
Dr. Brandon Bourgeous answered

Specializes in Obstetrics & Gynecology

Well...: At 10 weeks, an ultrasound has a margin of error of about 5-7 days. The u/s estimate should be equal to the number of weeks since your last period started +/- 5-7days. If you have regular monthly cycles of 28-30 days and it was 10 weeks since your LMP and you are certain of the 1st day of your lmp, then you may both be right.

Dr Fowler and another doctor agreed

Answered 2/13/2015

5.1k views

Thank

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