The guy I've been with for over a year purposely came in me. So that's why I believe it's him but I was most fertile with my one night stand but we used a condom
I'm going through the same thing you are with the same exact scenario only the one night stand I had I had known since 6th grade so a very long time and we used a condom and he still pulled out I hope the guy I'm with is the dad he's been there through my whole pregnancy and I'm 34 wks 1 day. He knows about it but we believe it's his. Idk good luck to you girl it's a hard situation
Google conception calculator
You were more fertile with the guy from the one night stand, but if the condom didn't break or have a hole then i say it's the guy u had unprotected sex with BC even precum can get you pregnant. I conceived on a day i was not fertile & i did the pull out method but still got pregnant. My gut tells me it's with the guy you know for a year, but icould be wrong
You will probably need a DNA test to know since the dates are so close
Condoms are not 100% effective but if the condom didn't broke then there's the chance that the one night stand is not the father. since you had unprotected sex with the guy that you have dating for over a year then there's a higher chance that he is the fathers baby.
You can always check your ovulation date. Usually it's 14 days after the first day of your last period.