my period was supposed to come december 3rd 2010. 3 weeks an 2 days later and still nothing. me an my boyfriend had unprotected sex november 13th, 20th, and 21st. i have taken 3 home pregnancy test and all came back negative. on the 28th (a week before my period was supposed to be due) i had cramping, pink blood only when i whiped and my boobs were swolen an hurting. i was bloated as well. i thought i may have been having my period early but only an hour an a half later i stopped bleeding. and yesterday (dec. 25th) i started bleeding again so i put a tampon in and when i took it out 8 hours later only a little spot on the tip had blood and now im not bleeding anymore, whats going on with my body? could i be pregnant?