So I had sex with guy number 1 on the 18th of November we were intoxicated and I think he busted inside then I had sex with my ex on the 25th of November and he busted inside for sure. The last day of my period was the 11th of November and now I'm pregnant. ive done a lot of tests and it says I conceived on the 25th but how do I know who the father is? Please help.