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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Is Date Of Conception Calculated Based On The Last Menstrual Period?

I had sex on a supposed ovulation day 08/13 with guy A. And sex with guy B the rest of the month. Got what I believed to be my period on 08/26, and continued sex with guy B. Took a preg test on 09/26 and it came up positive. Went to doc 10/03 and was about 4.5 weeks pregnant. Is there a possibility the dating is wrong and I got preg from guy a?

My doc told me however I conceived 09/15 or around there. Is he basing the conception date off of my LMP? Or what
Mon, 21 May 2018
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OBGYN,  's  Response
Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.

According to your question you might have conceived in second cycle and around 13th to 15th September as told by your doctor.Conception occurs at around the period of ovulation whereas gestational age is calculated according to last menstrual period.

Hope I have answered your query. Let me know if I can assist you further.
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Is Date Of Conception Calculated Based On The Last Menstrual Period?

Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. According to your question you might have conceived in second cycle and around 13th to 15th September as told by your doctor.Conception occurs at around the period of ovulation whereas gestational age is calculated according to last menstrual period. Hope I have answered your query. Let me know if I can assist you further.