A member asked:

Am preg. my last period is 4/13-4/18. am trying to calculate when i get preg. it so confusing. when do i ovulate and conception or conceived happen?

5 doctors weighed in across 3 answers

Dates are estimates: If the math is confusing, one should stop over-thinking it. With regular, 28-day periods, presume that ovulation is on day 14 (april 27) and presume conception is on the same day. All numbers are estimates, no matter what number any doctor says. So, over-thinking the issue is not helpful. Another way is to let the ultrasound tell you the pregnancy start date, with being conception 2 weeks after.

Answered 6/3/2013

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Probably 4/27: Ovulation occurs 14 days before the period begins. So, if your cycle is usually 28 days, then ovulation would have likely occurred on the 27th of april, and concetion on that day or the following.

Answered 6/3/2013

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About seven weeks: In a 28 day menstrual cycle, ovulation occurs approximately on day 14. Being june 2, 2013 today you are approximately seven weeks and one day. Your due date is approximately january 18, 2014.

Answered 6/3/2013

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