My last period started on the 23rd. The first guy I slept with 14 days later on the 7th. (Of the next month) He definitely came inside me. The second guy was on the 10th. We used a condom but it came off during, I dont know if he came (but theres precum?) I know its only 3 days apart but is it more likely the first guy is the father? I didn't keep track of my periods so I have no idea if they were regular or not