Help!! What could this be??

Star

I’ve had sex 6 days ago and since then I’ve forgotten to take my pill and missed it. Couple days after my missed pills I had some light bleeding for a few days and thought it was normal because I missed pills it slowed down and stopped then the next day I got really bad cramps in my lower and high stomach and there was blood but not much like a period would have. Would could this be? Could I be pregnant?