I'm 18 and me and I had unprotected sex with my boyfriend for the first time on saturday (2/16/13). The next day I had a little bit of cramping and then it went away. Today is thursday (2/21/13) and i have cramps so bad that i wana cry. i'm VERY nauseas. Anything that is cooked makes me queasy. I pee alot, have really bad headaches and I'm tired all the time. I'm on the shot and i know birthcontrol isn't 100% effective but i was wondering can i be pregnant?? Please anyone help! I really don't know if it's just me or if it's real! Thank you! :)