I got my last shot July 23, 2010. My shot ran out on October 22, 2010. I had a light period in November but I can't remember exactly when. I had my last period December 17, 2010. I've been waiting for my period to start. I have headaches, diarrhea, bloating, and a little nausea. If it doesn't come by Wednesday I'm going to take a pregnancy test.