I need some comfort.

I was with this guy for a while and we had sex. I’m not sure where he came, and now I’m just a little worried. It was a day or two after my period and I’m just worried I won’t get it and that I’ll be pregnant. I’m not with him. We’re not on the best terms. My family doesn’t like him. It’s just such a fucked situation. My periods are a little irregular and this app says I should get it in 3-4 days but I have another app that says I’m 3 days late. He told me he’ll buy a test on the May 5 if I haven’t gotten my period by then but God I’m praying I get it. I’m really fucking scared.