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Dr. Andrew Rynne
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Dr. Andrew Rynne

Family Physician

Exp 50 years

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How Can The Paternity In A Pregnancy Be Found?

if my last period was sept 7,2009..and my due date is june 14,2010 iam 30 weeks pregnant i most likely conceived from sept 18,2009 to sept 23,2009.. i did it with guy A on Sept 11,12,15,16,17,21,22,23,24,27,28,30 and i did it with guy B october 8 only who has the most chances of being the father? and to help october 7 i had already missed my 1st period.. i found out i was pregnant october 16,2009i really want it to be guy A
posted on Thu, 13 Mar 2014
Twitter Fri, 12 Feb 2016 Answered on
Twitter Sat, 13 Feb 2016 Last reviewed on
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OBGYN,  's  Response
Hallow dear,

you had your menses on 7 Sept. so your next expected menses were somewhere around 7 Oct. considering your cycle of 30 days. The egg is released 30 days. The egg is released 14 days prior to next expected menses which in this case would be on 23 Sept. Egg has life of 24 hours while sperms are active for 72 hours. Hence a period of about one week around the day of egg release (ovulation) is considered as fertile period; which in this case would be from 19 Sept to 27 Sept. Even considering your due date as 14 June, the date of ovulation would be 21Sept. so by any calculation, the intercourse on 8 October would be most unlikely to cause pregnancy. You had many intercourses with person A during the period between 19 to 27 Sept. So person A seems to be the father of this child, not person B.

Moreover if you want an authentic proof of paternity for legal purpose, you may opt for DNA test.

I am sure, this will serve the purpose for you.

Dr. Nishikant
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How Can The Paternity In A Pregnancy Be Found?

Hallow dear, you had your menses on 7 Sept. so your next expected menses were somewhere around 7 Oct. considering your cycle of 30 days. The egg is released 30 days. The egg is released 14 days prior to next expected menses which in this case would be on 23 Sept. Egg has life of 24 hours while sperms are active for 72 hours. Hence a period of about one week around the day of egg release (ovulation) is considered as fertile period; which in this case would be from 19 Sept to 27 Sept. Even considering your due date as 14 June, the date of ovulation would be 21Sept. so by any calculation, the intercourse on 8 October would be most unlikely to cause pregnancy. You had many intercourses with person A during the period between 19 to 27 Sept. So person A seems to be the father of this child, not person B. Moreover if you want an authentic proof of paternity for legal purpose, you may opt for DNA test. I am sure, this will serve the purpose for you. Dr. Nishikant