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Had sex with two persons around OVULATION. Who is father?

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yes I need some reassurance. My last missed period was December 10th. It lasted for about 6 days. I had sex with one partner on the 17th. I am 85% sure he did not ejaculate and he agrees. A week later on the 24th and 25th I had sex with my boyfriend and he ejaculated both times. I am pretty sure my ovulation date was the 24th. Today I am 10w6d pregnant. I had my first ultrasound with my doctor on February 5 when I was 8 weeks 1 day. My due date is September 16. Who is most likely the father

Category: OBGYN

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Category: Infertility Specialist
 32 Doctors Online

Thanks for posting your query at
1. On the 17th of December, ovulation is least likely.
2. It is very likely you ovulated on the 24th or 25th.
3. Going by the dates, it is very likely you conceived on the 24th or 25th.
4. Can you upload the first ultrasound scan report please ?
5. Going by the due date, again, the conception date is most likely the 24th or 25th .
I would wait for your scan report, but in all probability, your boyfriend is the father.
All the best
Please feel free to discuss further.

Patient replied :

Okay so I am just very worried. I have heard from several people that ultrasounds can be off by 6 days. If i had sex the 17th OR in the early hours of the 18th of December and ejaculation did occur, is there sperm still lingering around? I heard sperm can live up to 5 days does that make any sort of difference? I am hoping my boyfriend is the father and i know it was a bad decision but I need answers. From calculators online my conception date was the 24th of December which was when my boyfriend and I had sex, making my due date September 16. I've had two ultrasounds on 1/13/15 I was 4w6d 2/5/15 I was 8w1d. What is the likely outcome

Going by both the scans, the likely date of conception is 24th or 25th of December.
Sperm rarely survives up to 5 days, and the scans clearly give the date of conception around the 24th of December.
First-trimester scans can be off by up to a week,
But the scans are consistent in the dates.
It all fits together.
Your last period, the probable time of ovulation, both the scans - there is nothing to suggest that you conceived around the 17th / 18th.
Of course, short of a DNA paternity test, nothing is 100 % conclusive.
Take care.

Dr. Aarti Vazirani
Category: Infertility Specialist
Residency: Obstetrics & Gynecolog, BJMC,Civil hospital, Ahmedabad, 2008
Post Graduate: MS (Obstetrics & Gynecology), B.J. Medical College, Ahmedabad, 2008
Medical School: MBBS, B.J. Medical College, Ahmedabad, 2004
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