My last period was Feb.15-19. I had unprotected sex with my boyfriend on the 26th. He pulled out but I know about pre on the 27th. I did something stupid and had sex with someone else but with a condom. As far as it breaking or coming off I didn't see none of that and the guy with the condom said he pulled out before his sperm came in the condom.

Well I am now 26 weeks and 5 days I believe due to my measurements but if we use my first ultrasound I'm like 25 weeks and some days my OB want to stick with the 26 weeks. Well my question is will the baby most likely be my boyfriends since we didn't use protection? I just need some peace of mind until the day comes.

It's too close to call. Condoms are not perfect birth-control devices. You'll have to get both men tested in order to see which one matches the baby's DNA.

You're going to have to wait until the baby is born and find out the father using DNA testing.