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Unprotected sex with two men, tested positive. Confused who the father is? Concerned about my conception date

My LMP was 23 December. I don t have regular periods. I had sex with my bf on 6th jan, 10th jan and 14th jan. I broke up with him and went with another guy and had sex with him on 16th jan. though he ejaculated outside, but I doubt that since he pulled out at last minute he might have spilled a part of it inside me. I tested positive on 25th jan morning. It was a very faint positive and test sensitivity was 50 iu/ml. And again at night I took test which was strong positive. I had first ultrasound on 13 feb which showed me 6 weeks 6 days. CRL 8mm and MSD 16mm. and my second ultrsound was on 25th feb, which showed Crl of 2.4 cm and gestationa age 9 weeks Confused who the father is and why doesn t my ultrasound match my LMP. Please help. I m Really concerned about my conception date.
Asked On : Fri, 1 Mar 2013
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OBGYN 's  Response
Mar 2013
thank you for your query.
Firstly your ultrasound scans DO match your LMP.
Gestational age is calculated from the date of the last menstrual period, and not from the date of conception / ovulation.
As per your LMP, on 13th February , you would be 7 weeks and 3 days, while the ultrasound had a difference of 4 days ( which is within normal limits of error of the ultrasound machine ).
Regarding 25th February, you should have been 9 weeks and 1 day by LMP, and you were 9 weeks, so that too matches perfectly.
It appears that most likely you conceived from the acts of intercourse with the first person, and not from the second guy ( 16th january )
However, please remember that the only 100 % confirmatory method would be to undergo a DNA paternity testing.
Take care.
Answered: Sat, 2 Mar 2013
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