Paternity

[cka949]

I have a paternity issue. I don't know my last lmp. I had my first ultrasound when I was 6w 1d that dated my conception April 9th. The second ultrasound was 2 weeks later but measured me at 7w 3d.. So a minus 5 days and made conception April 15th due January 6th. Both doctors knew I was trying to find conception for paternity and the 2nd ultrasound she decided to transvaginal and abdominal to be sure. At 16w 1d I was measuring two weeks big. They said that the baby was just big and we would go with the first 2 scans. I had sex with guy1 march 31st and guy2 April 6th and April 12. Both doctors reassured me it was guy2 and they couldn't push my conception date that far back to guy1. I'm getting a prenatal paternity test done right now just want another opinion of who it might be. Thanks

[cka949]

Ya it gives the possible conception at april 11-19

[cka949]

What about a due date of jan 6th? That is the one they are going with, my second doctor told me we would go by that scan because the previous one would have about 5w 3d and she could see more clearly at 7w 3d. I used a different place but I have samples from both fathers so it should work by exclusion

[AnnieBrooke]

For a due date of December 31, the conception calculator I use says

     Probable date of ovulation:  April 9
     Possible dates of conception:  April 5 to 13

As your doctor said, even with that earlier result, it would be a stretch to take things back to March 31.  Some research suggests sperm can live a while in your system (some says four to six days, some says longer, and some says that even if it lives longer it is not very hearty and might not be able to penetrate an egg later on), so I am glad you are getting a prenatal DNA test.  Do you mean a blood test?  (I.e., not chorionic villii sampling or anything invasive?) If a blood test, I hope it is from Ravgen or DDC, others can come up with equivocal results.

[cka949]

The first one said I concieved the 9th with a due date of dec 31 and the 2nd one said I concieved the 15th with a jan 6. They went with the 15th because she did 2 ultrasounds that day. If the difference is cut it's around the 12th which is a day I had sex. The 9th or the 12 give a 3 day window where I Could have concieved.

[AnnieBrooke]

Did they give you a due date at the first ultrasound that was a lot different?  

[cka949]

7w 3d the second one

[AnnieBrooke]

Which ultrasound said you were due January 6, the one at 6w1d or the one at 7w3d?