Please I need some answers and help

So I got my period. My tampon was in when my bf and I attempted anal in the shower. I was beans over and his dick just would not fit in my ass lol... When I put my hand down there I felt this slimy wet stuff... My tampon was in so I don't know if it was HIM or ME. WHICH ONE WAS IT. AND AM I PREGNANT. PLEASE HELP ME. I have a 25-30 day cycle