should i take plan b?

TMI but ok so night before last night my partner & i were fooling around a bit one thing led to another & he finished near my vulva, but i’m afraid that some of it got onto my vaginal opening. should i take plan b (or any other emergency contraceptive for that matter)? i just got off my period the day before it happened, and we didn’t have vaginal sex at all. thank you sm!!