Different dads

My boyfriend and I were going through a rough patch and broke up, well I had sex with someone on oct 2, but regretted it quickly and made him stop before he even came, and he said he didn’t even cum. I then had my period oct 12-17 and my boyfriend and I started working our problems out. I then found out that I was pregnant Nov 12. My dr determines my

due date by the first day of my last period which like I said is oct 12, and they said I’m 16 weeks. And I’m almost positive that the baby is my boyfriends. There’s no way it would be the other guys right? Please no judgement.