So the math. : You need to convert the total number of days of days since the first day of your last period. That is 4 weeks or 28 days plus 5 days, thus 33 days. Then subtract 14 days from 33 days, since you ovulate usually 14 days after you last pregnancy. 33-14 equals 19 days. 19 days ago is approximately when you got pregnant.
Answered 5/26/2013
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