I found out that I was pregnant in January. Saw my Dr. on Feb 15,2008. She said that I was 9 weeks and my due date is Sep 18th, 2008. And that I conceived around the 26th of Dec. Now here is my problem. I slept with someone outside my marriage. It was either on the 1st or 8th of dec. I know I had my period about 4 days or so after those dates. Now Im worried about if for sure my husband is the dad. I also just went to the Dr. on the 18th of march and the altrasound tech said she thinks I was 14 weeks and 3days. I took a pregnancy test on the 12 of Jan and it was positive. I have a gut feeling its my husbands baby, but My mind still wonders. Since I did have a period after having sex with this other guy. Could I cancel him out?

Yeah, it's probably your husband's baby. What would you do if it wasn't?

If the dr said you conceived around the 26th and you were not with the other guy around that time I would guess it is your husbands.

It's honestly too close to call. Ultrasounds are just estimates... as you can now tell from the differing opinions as to how far along you are.

EIther man could be the father.

The only way you are going to know for sure is by getting a DNA test done once the baby is born.