oh vey

okay so my period ended like yesterday but like ended I mean it was the slightest amount of brown blood remaining, and so me and my boyfriend were blessing around and his dick was on my vag like a lot and i know for a fact I was really wet. I'm really scared that maybe if I'm fertile or something this could result in pregnancy , I'm not on birth control and we use condoms for sex but he didn't have one on when he just kinda put it on me (not in) please help!!! Super worried and curious if I should take plan b just to be safe