Could I be pregnant??

A
I've been having unprotected sex with this guy for the past few months but last week we had sex a few days before ovulation days then the day before then the day before my peak of ovulation. Well that day I was supposed to peak I started bleeding that night now it's day 3 and I'm still kinda bleeding here and there. Is this normal is it possible I could be pregnant? I've been feeing nauseated and tired like a not normal tired. And light cramping. Maybe in should go to the doctors. But idk