Pregnant From Fingering ?

I was messing around with this guy let’s call him guyA on the 27th of January. He was jerking off (I’m not sure if he came or not) but then about 8 minutes later he fingered me. Then on Jan28th I had sex with guyB we didn’t used protection (and he came in me) I’m currently pregnant , but I’m stressing myself out thinking it could be guyA baby , I asked my doctor when I conceived and he said around Jan28-29 .. I’m almost certain it’s guyB baby and I’m ok with that but i just can’t stop thinking wether there’s a chance it’s guyA baby .. Can you guys just give me some reassurance it’s not guyA baby .. Thank you in advanced 🙂