implantation bleeding?

okay so i had unprotected sex and it’s been about two weeks, my period starts in 4 days but i had bleeding and it was lighter than usual . i searched up that implantation bleeding is more pinkish or brownish. i had both but it said it’s not bright red but i had all three. i’m sure he didn’t have cum in me but i’m just wanting to get some advice over this . could i be pregnant?