Help figuring out who’s the dad possibly

So I had my period Jan 22-26. It came early. Normally comes 26th or so. I have pcos ( just some background info. ) I had sex with my partner the 27th /28th briefly without protection. He pulled out and put a condom on and we finished. On the 1st of February, I had sex with someone else, unprotected several times in 2 hours but he pulled out and only ejaculated once ( outside of me). We did have sex on and off. But he’s older and claimed a) he’s too old to impregnate someone ( he’s 50) and says he ejaculates few and far between now ( eye roll). I think perhaps he didn’t pull out fully in time. It stresses me out because I did a test today and had a faint line. So I am not 100 percent sure who could be the dad. I think it’s the second guy because even though he pulled out, we still had more unprotected sex and possibly more Precum. With my partner it was super brief and he ended up finishing in a condom. I don’t mind having another baby but I’m hoping it’s really my partners . We started an open relationship and I feel so stupid the first outside person I slept with, now I am probably pregnant and don’t know who’s it is 😩 any ideas ?