Me and my exgirlfriend enganged in sexual intercourse. I did not use protection but I did not ejaculate, at all. Let me clarify, I did not do the "pull-out" method, or anything like that, I legitimatly did not ejaculate what so ever. She had her period four days later. But she claims it wasnt a normal period. She said it lasted 2 weeks and was different from most of her normal periods. We broke up due to an unrelated subject. About a month later she engaged in unprotected sex with another man, this man did not use protection, whether he used the "pull-out" method or ejaculated inside of her is unclear to me but after she engaged in sexual intercourse with this man she missed her period, about 3-5 days after she missed her period she took a pregnancy test and it came out negative, but she took one three days later and came up positive. The thing I am clearly curious about is if could be my child or not. Though I did not ejaculate inside her there could be potential pre-ejaculate, and im completely bewildered about her extremely long and unique period, I have no clue if her extremely prolonged period could potentially mean theres a higher or lesser chance it is mine. Please answer this I will be extremely extremely grateful.