Horrible question

Okay so I was super drunk when me and my long term bf had broken up and a guy had sex with me when on August 1st. My period came August 10th through the 17th and then me and my BF got back together and had sex all throughout the rest of August and more (to this day lol). I got my positive September 12th and it says I conceived August 24th or somewhere around there. And the doctors dated me from Aug 10th of my last period and haven't told me I'm further along than I thought. Is my boyfriend the Dad, or is there a possibility of it being the other guy 🙁 I've been stressing it since day one. And yes my boyfriend does know about the other guy!