Paternity Assumptions.

I’m very much aware of my choices and the results they have made. I’m keeping my baby boy at the end of the day. My question is if my ex or my childhood friend could be the potential father. They are both aware of the situation, but I just would like to just have more reassurance I guess? Anyway, I have a 26 day cycle and my LMP was August 17, 2018 (this was a 7 day period which is really weird because they usually last for 4 or 5 days). I had sex with my ex boyfriend on the 23rd & 24th using withdrawal method, unprotected. He didn’t finish inside of me. On August 30th, I had what started off as protected sex but he ended up taking the condom off during. Using withdrawal method and he also didn’t *** in me. A lot of the calculators say probable intercourse could’ve been from Aug 24th-29th for a 26 day cycle. Based on what my doctor first went off of, conception date would’ve been the 30th but at my 20 week ultrasound I was measuring 2 days ahead. So, today instead of being 22weeks, I’m technically 22weeks and 2 days... help¿

To add, no I sadly didn’t get an 8 week ultrasound, my OB didn’t give me one for some reason. We just did a lot of blood work. I had very high levels of HCG so I was very very pregnant