How do you know who’s the dad??!

So I had sex with someone 20 days before my period ( 1st day of ovulation 🙈) and we used condom , and the last two weekend I slept with someone I used to date like 6 months ago (I know ) we didn’t use condom and now my period is late like 3 days I’m scared to take a pregnancy test as I’m not sure who can be the dad in case I am pregnant how would you know 😫😬😬 any suggestions pls?