I'm 17. I'm Almost Two Weeks Late On My Period.

I'm 17. I'm almost two weeks late on my period. I've taken three test. One, a week before my period was due, then another one, when I was 3 days late. And one when I was a week late. I've been cramping and hurting in my stomach. I can't tell if my discharge is different or not. I feel like my period is about to come but hasn't. It's never been this late. Im still I'm worried if I'm pregnant since I've had unprotected sex since my last real period.