Easy to estimate: Nobody ever knows exactly when a natural conception happened. It is impossible to know when a sperm entered the egg. To estimate that date, count backwards "2 weeks less" than the current age of the pregnancy. That means grab a calendar, start from the day the ultrasound scan said "5 weeks 2 days," and count backwards for "3 weeks 2 days" to land on estimated conception day (plus or minus 1 week).
Answered 11/9/2020
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