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A member asked:
When sonograms are done in 2nd and 3rd trimesters, are those based on lmp or by growth? i'm trying to figure conception date
A doctor has provided 1 answer
Earliest due date: The due date is based on the first day of the last menstrual period and confirmed or changed based on the earliest ultrasound. Ongoing ultrasounds are based on the LMP due date or earliest ultrasound due date. So use your due date to find possible date of conception - google an app for that.
Answered 9/15/2020
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When a doctor says margin of error is 3-5 days in first trimester us are they talking about lmp, due date, or conception date?
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