implantation bleeding or period

so yes there might be a chance i’m pregnant but super small because it was never while i was fertile and he didn’t cum in me. but i was suppose to start my period yesterday but i didn’t all day yesterday or today and i was scared there’s a chance but i kept a pad to make sure i didn’t start and bleed through. TMI i took it off and there was a bit of brown and when i wiped it was a little bit of pinky red blood. and i know implantation bleeding is a thing... so idk if i’m pregnant or just my period starting