Hey I Am A Drug User And I Was Clean

Hey i am a drug user and i was clean for 4 months and didn'tget pregnant then iIstarted using and got pregnant after using for a few months had sex with my bf for all these months and he ejaculated inside me about every day and there was another guy who pulled out and i had sex with him while using heroine about 2 times Iwas just wondering what ppercentage if is that it is the other guys baby and not my bf