My last period was 14th - 20th September (my periods are regular) I had unprotected sex on 23rd 24th 26th and 27th September with the guy I have been seeing on and off for a year, then stupidly had sex with my best friend on the 29th after an argument with guy 1, however wore a condom which I'm 99% sure didn't break. I am 7 weeks pregnant exactly and just want the peace of mind that man #1 is most likely the father.
Used properly a condom is very effective. That means it was on before and during ANY sexual contact.
Guy #1 is most likely the father.
You'd need a DNA test to be definitive. Timing wise it could be either.