Is it true or not?

Tomorrow am suppose to get my period but I always get some kinda pain one day before..but i didn't get it...I think that am pregnant since I have been having UNPROTECTED with my boyfriend from Novemeber 16-Decemeber 10...I also have been feeling dizzy, tired as hell...and vomit a little bit. the veins on my show up too..ooo and I cried 3 times today for absolutly no reason..could it be that am pregnant?