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Paternity Question at 7 weeks

Hello Annie,

You seem to have helped a lot of people on this thread and I hope you can calm my fears as well.  I really want to be the dad but there is another man that gives me a little cause for concern.

My long term girl friend and I have been together for almost 3 years.  We used the pullout method until about 9 months ago and she started taking birth control.   In August this year she decided to stop taking the pills because they made her feel "weird".   On Aug. 28th she started her period and on the 31st she took her last pill.  The period was lighter than usual and only lasted 3 days.  

Based on the ultrasound we are being told that she is currently 7 weeks along with her LMP at September 8th.  The due date is scheduled for June 14th 2016.

Here is an outline of the events in September & October:

Sept 12th:  Intercourse - I pulled out
Sept 13th:  Intercourse - I did not pull out
Sept 20th:  Intercourse - I think I pulled out but I'm not positive
Sept 23rd:  She had sex another man.  He wore a condom and he did not ejaculate while inside her.
                   I have spoken to him in person and his adamant he used protection the whole time.  
Oct 10th:  Took a home pregnancy test
Oct 14th:  Had the first ultrasound. Only the sac was visible but the sonographer guessed the age at 5 weeks
Oct 27th:  Had another ultrasound.  Sonographer put the age at 7 weeks and LMP at Sept. 8th.  
                 EDD at June 14th, 2016

The doctor pulled out the pregnancy wheel and said she could have gotten pregnant anywhere from the 15th until the end of the month. Conception date was set at Sept. 22nd (one day before meeting the other guy)  Before birth control she had a 30-34 day cycle, so we never knew exactly when she ovulated.

The logical side of me says this is my child but the dates given by the doctor give me some reason for doubt.   I would have thought we would be at least 8 weeks along at this point.  Any input on the chances of it being the other guys would be appreciated.

Thanks
11 Responses
134578 tn?1614729226
COMMUNITY LEADER
She was 7 weeks 0 days when she had the sonogram?  Or just "You're around 7 weeks"?  

Avatar universal
Thank you for the reply.   Sonographer said around 7 weeks they didn't break it down by days.  
134578 tn?1614729226
COMMUNITY LEADER
Why did you think you would be at 8 weeks by now?
Avatar universal
We know her LMP was Aug 28 (even though the doctors put it at Sep 8).  She should have been ovulating between the Sep 11 - 17. I would think conception happened between the 13th - 17th.  The doctor is giving us a conception date of the 22nd. Maybe I'm not understanding the doctor's dates correctly. The 22nd date is so close the 23rd that it makes me extremely nervous.
134578 tn?1614729226
COMMUNITY LEADER
The chances of the other guy being the dad are less than of you being the dad, especially since he used a condom, but given the information you have, they are not zero.  It would help a lot to get a second ultrasound for dating purposes, to see if it tends to rule him out.  

In your shoes, I'd get another ultrasound (from the same technician as before or possibly a different one) first, and if it does not clarify anything, I'd do a prenatal DNA test from Ravgen or the DDC with you and the other guy both providing samples.  The first option is a lot cheaper, start with it and do it very soon.  Tell them that your girlfriend's cycles are irregular, and you'd like the due date to be based only on the developmental markers of the embryo and its crown-to-rump length.

Avatar universal
Thanks for the advice.  I think we will get another sonogram early next week and if the dates are still close we will have a prenatel paternity test done.  
Avatar universal
Annie,

We did a prenatal paternity test with Ravgen this week.  My gf went in on Monday.  The other guy and I did our mouth swabs on Tuesday.  If the samples are all good how long do the results normally take?  

134578 tn?1614729226
COMMUNITY LEADER
Hi, Surprise, that I don't know.  Sometimes women post on the site that they have gotten their results very fast, like a couple of weeks, and other times they mention a different lab and say their results took longer.  I think it partly depends on whether there was enough DNA in the sample (sometimes the lab requests more samples).
134578 tn?1614729226
COMMUNITY LEADER
I haven't seen any posts saying Ravgen was slow, only about a different lab.  But one person had posted about having to get more samples when she was testing with Ravgen.
Avatar universal
Hello Annie,
We just received the results from Ravgen, so it took 6 business days from my test to get results.  Over 99% probability that I am the father and less than 1% the other guy.  This is the result that I / we wanted.  

I asked the Ravgen employee about false positives and they said they have only had two that they are aware of.  In both cases they only tested on potential father.  After researching the results of both cases the men had the same ethnic background or they were distant relatives.    

I feel confident in the results and will sleep easier tonight.  I want to enjoy this process with my gf.  That being said I will still have a paternity test after the birth and post the results here.  Thanks for all the support you give everyone here.
134578 tn?1614729226
COMMUNITY LEADER
It really sounds good.  I'm glad you and the other guy both tested, it is so difficult for people to really feel comfortable when only one person tests.  Glad for you.

Annie
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