Could I be pregnant?

I had unprotected sex on aug.5th.2017

My last period was from July 26-31st

I threw up in the late afternoon after I ate eggs. I had just came back from a camping trip for the weekend and didn't feel like eating but I felt that I should put something light in me. During my camping trip I had dieherra & felt lightheaded after hiking. I've been loosing my appetite a lot since I've come back from camping. At times I feel like throwing up, I have cramps. They switch from one hip to the other or like now it feels like I'm having cramps. Today I had a scant, white, kind of sticky vaginal discharge. The first time I wiped, a little red dot appeared, I wiped again and no blood continued to come out. Only the scant, white, kind of sticky vaginal discharge came out, it has no ordor btw. I'm 17 & I just started school again & I don't know if feeling tired is coming from starting school again or if I'm possibly pregnant?