Help! :(

This might be dumb but I’m a girl with a lot of anxiety and just need opinions and help easing my mind. My boyfriend and I took a shower together and I have him a hand Job and he came and some was on my stomach and I don’t know where the rest went. What I’m asking is... is it possible to get pregnant ? I got off my period almost a week ago and I’m just anxious about it. I don’t know if it could’ve washed down my body and then entered my vagina? I am on the pill as well I’m just paranoid. Someone please respond. Lol this is embarrassing. Thankyou ❤️