Is it possible I could be pregnant?

My period just started getting regular again. (I was raped in feb, got preg, but miscarried and lost it.) The first day of my last period was May 19th. My cycle is usually 28-30 days long. I used an online ovulation calculator and it says my most fertile days were June 1st through June 6th. I had sex June 4th, we used a condomn, but didn't realize till we were done it broke. My period is supposed to show up like May 16th-May 18th. I've been extremely tired, back pain, tingly nipples. I've had headaches, and I'll be really really hungry but whenever I actually eat I feel so sick. Or randomnly I'll just feel the urge to vomit but I never do. I've also had a slight fever. Below my belly button and above my *ehm* I've had cramps, especially on the left side, and little.. twinges? Plus heartburn and I've been really gassy. *sorry tmi haha* Is it possible this is just a stomach flu, or pms symptoms? I'm only 15 and a sophomore, I'm kind of scared. also when should I take a test? I can't believe this happened.