Scare

So I haven’t gotten to the store yet for a pill bc I haven’t had the opportunity and my boyfriend and I had sex today..we used a condom but one of our stuff was all over after and we couldn’t figure out if it was him or me...we think it was him and i’m super scared i’m gonna get pregnant but it didn’t get all the way in i don’t think just on the outside...i’m really really scared and my period isn’t for another week but 1. should i go get the pill of i can??? 2. what do you think my chances of being pregnant are??