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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Had A Sexual Encounter With No Protection. Abdominal Ultrasound Revealed Empty Uterus. What Could Be The Reason For Conception?

My period cycles are usually between 29-32 days. I had a 32 day cycle that ended 9.23.13
I had a sexual encounter CD 18 with no protection, the male has low sperm quantity/quality - 10.10.13
I had a sexual encounter CD 23 and using withdrawal method -10.15.13
On CD 34 I had a faint positive pregnancy test, CD 35 it was darker. - 10.26/27.13
CD 36 a blood test: hcg levels of 165 (5w0d) - 10.28.13
CD 38 a blood test: hcg levels of 330 (5w2d) - 10.30.13, check pregnancy due to heavy spotting
CD 40, abdominal ultrasound revealed an empty uterus. (5w4d) - 11.01.13

We plan on paternity testing, but can you guess which encounter conception resulted from?
Wed, 20 Nov 2013
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OBGYN,  's  Response
Hello
Thanks for your query.
The difference between the two encounters is only 5 days
The accuracy of first trimester ultrasound scans is within a margin of error of 5 to 7 days.
So ultrasound can only give you the best of guesses with still a week's margin of error.
Regarding the HCG levels, they are unreliable in dating a pregnancy.
The best and most accurate way for you to establish paternity reliably is to go for the paternity testing.
Do not speculate or guess otherwise, it will never be 100 % sure.
Take care.
All the best.
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Had A Sexual Encounter With No Protection. Abdominal Ultrasound Revealed Empty Uterus. What Could Be The Reason For Conception?

Hello Thanks for your query. The difference between the two encounters is only 5 days The accuracy of first trimester ultrasound scans is within a margin of error of 5 to 7 days. So ultrasound can only give you the best of guesses with still a week s margin of error. Regarding the HCG levels, they are unreliable in dating a pregnancy. The best and most accurate way for you to establish paternity reliably is to go for the paternity testing. Do not speculate or guess otherwise, it will never be 100 % sure. Take care. All the best.