What is wrong with me?

I'm a little stuck. I can on my period on the 19 for only 3 days.(normal for me). After my period me and my boyfriend has been having unprotected sex consistently. He never pulls out. Lately I've been eating less and when I eat something my stomach tends to get weak. I haven't been having an appetite but I feel so sleepy and my stomach cramps up. I've had a few drinks these past couple nights and couldn't sleep because of stomach pains. On top of that anytime I have an argument with my boyfriend. I get light headed and feel weak. Does that mean I'm pregnant? Or is there something else wrong?