Well my friend and her boyfriend talked about what happened between her and this other guy and they have decided that she should give the baby a paternity test to make sure. Well here is what happened before she got pregnant:

On the day before she ovulated, her and her boyfriend had sex with him ejaculating inside of her. This occured around 4 in the morning. That day she went with this other guy she was dating as well and around 12 midnight they had sex but didnt finish. (he didnt ejaculate at all and it only lasted about 15 minutes) He states that he cannot have kids due to a medical condition although he would've loved for the child to be his. Well she is worried about the precum and I honestly believe that its her boyfriend's because he not only ejaculated inside of her but he did about 15 hours before she had sex with this other guy and he didnt do anything at all.

What is the percentage that the baby is the boyfriend's when he was the only one who ejaculated and the other guy states that he cannot have kids because of a medical condition??? Please only serious answers. Thank you!