Help..

I had sex on Sunday, we didn't get far because we were fooling around and laughing and he didn't cum in me either. Lately I've been noticing brown discharge, started Monday I think or probably Tuesday morning and it hasn't stopped, even till this day.. I'm scared. Idk what to do, why this is happening, and my period is supposed to be in 5 days but this has never happened to me, even when my period is about to come