I Had My Period On July 14 It Ended On

I had my period on July 14 it ended on the 19. On August 30 I started bleeding again first very heavy then light for 2 days by the 3rd of September it was done. Since the beginning of August I've had some light, clear discharge as well along with some mild cramping, weird cravings, I'm very emotional and have tender breasts/nipples. All signs point to pregnancy, except....my tubes have been tied since May 29 of 2009. Is it possible I'm pregnant? If not what else could it be?