Is there a possibility

[Brittay22]

So I went out of town with this one guy between June 24-30th. We had unprotected sex two day out of the whole trip. We ended up breaking up when we got back and I started talking to another guy.

So I believe I did have a period in July around the 11th but I can’t remember. Me and them other guy started having sex shortly after that and now I’m pregnant. When I went to the Dr. on September 9th and had a ultrasound I was 8w6d pregnant and on September 5th I was 8w2d.

My 19 week ultrasound showed me mesuring at 22 weeks. So my question is do you believe #2 is the father or #1?  

[AnnieBrooke]

Sounds like you got pregnant sometime between July 20 and 26. Your doctor would never have told you 8 weeks plus in September if you got pregnant in June.

Are you aware of how the "weeks pregnant" are counted? Doctors begin the pregnancy time period at the first day of the last period, not at the assumed conception date. So being told from an ultrasound that you were 8w6d "along" is the same as being told you were 6 weeks 6 days  from conception at that point. There is a little margin for error when using an ultrasound to try to date conception by the eighth week, but only a few days' worth, not a whole month's worth.