A member asked:

Sex 10/22, 8 wk ultrasnd says conceive 10/27 but had very tender breasts as of 10/28 which contd. until end of 1st tri. is the ultrasnd date wrong?

A doctor has provided 1 answer
Dr. Michael Gabor answered

Specializes in Diagnostic Radiology

8 weeks: At 8 weeks the margin of error for ultrasound dating is +/- 5 days or so. If the US estimate is 10/27, then you could have conceived on 10/22. The US is not wrong, it is just reporting the average date within a statistical distribution.

Answered 6/12/2014

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