How To Confirm Pregnancy?

I started feeling sick 11/16. and was actually sick 11/21. I started off spotting, and having discharge. So i quit my B.C. Wondering if I was pregnant.(didnt want to do any harm). Then I started bleeding, like you would just coming off of the Birth Control.( three days) Been very crampy and achey. Been sleeping in til 10:00am, usually up at eight. Nausea, and feeling sick at smells of food, and even after I eat. Black Friday ( 11/25) I took two tests. One am, Negative threw away after I seen negative. That night took second one, waited a little longer for this one. Showed Positive. My question is could I be pregnant and it just is a little to early to detect on a test?? I was also sick tonight at my night class. I can t even stand to sit up straight just because it bothers my stomach to (put weight on it) you could say. I m not due for my period for another two weeks according to my pack.