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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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How To Determine The Date Of Conception Using Last Menstrual Cycle?

Hi, I am very interested in finding out when I conceived. I took an ovulation test on 8/2/14 and it was positive. Had sex with my boyfriend on 8/2/14 and 8/3/14. I had sex with a different guy on 8/7/14 and 8/8/14. Then again with my boyfriend 8/9/14 and 8/10/14. I found out I was pregnant on 8/17/14. After seeing the doctor, my due date is 4/25/15. Can I say with certainty that my boyfriend is the father???? Thank you, Stressed
Fri, 27 Mar 2015
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HIV AIDS Specialist,  's  Response
See it is very easy to calculate the date of conception using the date of last menstrual cycle. In your narrative you have not mentioned the date of last menstrual cycle anywhere but what you have written I think it might be in the month of august. The formula to calculate the expected date of delivery is to add 9 months and seven days or simply 280 days to the first day of women's last menstrual period. If your doctor is saying your due date is 04/25/15 than most probably your last menstrual period date is 07/19/14 or you can calculate it vice-versa.
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How To Determine The Date Of Conception Using Last Menstrual Cycle?

See it is very easy to calculate the date of conception using the date of last menstrual cycle. In your narrative you have not mentioned the date of last menstrual cycle anywhere but what you have written I think it might be in the month of august. The formula to calculate the expected date of delivery is to add 9 months and seven days or simply 280 days to the first day of women s last menstrual period. If your doctor is saying your due date is 04/25/15 than most probably your last menstrual period date is 07/19/14 or you can calculate it vice-versa.