Hookup gone wrong?

On Monday, I had hung out with a guy and things got "serious" we almost had sex but we obviously did other things and that includes him cumming everywhere. He had wiped it up but than later on there was a point when he was on top of me and I felt his dick on my vagina. Can anything happen from that? Like is there a chance the sperm would get in me? I've been eating a lot lately and idk it could be cause I might get my period soon but I'm not sure...