Hi, Can I Answer Your Health Question? Please Type Your

Hi, can I answer your health question? Please type your question here...So before my boyfriend and I broke up him and I had unprotected sex (as we were trying to have a baby since August) so when him and I slept together it was March 27. Then we broke up and I moved back home and a week and a half ago I had an ancient with another guy and I’m pretty sure he came in me, but I bought plan b 2 hours after everything happened. And then my ex came to see me 2 days after that and we slept together again .. I took 3 pregnancy tests a week right after the incident with the random guy and they were all positive, one said I was 3+ weeks and I had 2 blood work tests that are positive. But they couldn’t see anything in the ultrasound as it’s too early. Is there any chance that the random guy incident could be the dad ?? Or would it be my ex