well poop, reassurance?

alright ladies. i need some advice. im young. i don’t want kids but recently my boyfriend and i were folling around and he ejaculated on my breast’s. i rubbed it off with a towel and we then took a shower together. i’m worries that maybe some sperm could have gotten on my vulva or my vagina i know the chances are very slow but i started ovulating i cant remember if it was the week we took a shower (Monday) or if it was a few days after (Wednesday) i don’t take birth control so my chances are higher. i’m just looking for some reassurance.