Dating a pregnancy

In the second trimester, the determination also defaults to the LMP unless the ultrasound estimate is more than two weeks different from the LMP.We follow the same process in the third trimester, with a three-week difference.

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Handling Your Emotions Getting through the First Trimester Adapting in the Second Trimester Getting Ready in the Third Trimester Adjusting to the New Baby Show 2 more... Article Summary Questions & Answers Related Articles This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness.

Together, they cited information from 13 references.

If the ultrasound estimate differs by more than one week from the LMP, we would use the ultrasound estimate for the due date.

This method continues in the subsequent trimesters.

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