Help!!

So I was messing with my so last weekend and I was on top grinding against him and he put his tip in but he didn’t cum inside me( he’s never been inside me all the way) he came later when I gave him a bj. Just wondering cause I was really wet(turned on) my period is due in a day or so but Im not really pmsing so I’m thinking that I’m probably gonna be a little late this month butttttt what are the chances of pregnancy?