A member asked:

I would like to know when i conceived. my last period was sep 15 2012 3days .baby is 21 weeks 4days due date is june 22 did i get pregnant befor my perio?

A doctor has provided 1 answer

No: The LMP is the first day of bleeding during the last menstrual period. The number of weeks pregnant (weeks gestation) is counted from the LMP date, with the due date estimated to be 40 weeks after the LMP date. Conception is estimated to be 2 weeks after the LMP date. From the information in the question, the estimated conception date is around september 27-29.

Answered 2/13/2015

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