So last Friday me and my boyfriend had unprotected sex (i am on birth control though). Anyway later that day i noticed blood in my discharge. And then yesterday I noticed i was accidentally taking my birth control pills i need to take on my period. Could that be the reason why? Or is it implantation bleeding and I'm pregnant like google says? (I have no pregnacy symptoms and he didn't end up ejaculating in me bc he never got there bc we stopped)

Edit: if it matters my period isn't for another 11 days