aI just found out I was pregnant and I had a conception question. I had a one night stand on 10-20 and had my period 10-22. I did not use protection with him but he did not ejaculate in me. The other guy is who I am in a relationship with and we have never used protection and he ejaculates in me every time we have sex. My question is what is the likely chance of the guy I had the one night stand with being the father? I know yall are not doctors but I just need the input.