Pregnant?

Okay so this is a weird story but my boyfriend and I are scared and need advice. So about a week and a half ago my boyfriend and I were kind of messing around and i guess things happened. He didn’t even get it inside but he got close and we think he had pre-cum on his penis. I am now 6 days late on my period and wondering if it’s just a coincidence or if I could be pregnant. Also I have randomly been weeks late from what my period said before and before last week my boyfriend and I hadn’t done anything. Just in need of opinions, taking a pregnancy test tomorrow.