Spotting righty after period :/

Hey ladies so I got my period on the fourth of the month. My period usually lasts a week and is med/heavy flow. But this time around it was light/med it lasted the whole week but it should’ve stopped on the 11th latest 12th and didn’t instead it slowed down by a lot but I’m still spotting light pink and have been since the day it should’ve been over... I’m confused and have no idea what’s going on. Last time I had sex was a bit before my period. So I don’t even know if pregnancy is possible. But has anyone had anything like this?