No periods, but I'm off birth control.

I was on the depoprovera shot for about a year or so when I decided to stop (November 11th 2014 was when I was supposed to get my next dose) I stopped it once before and I went right back to having normal periods. This time however it's February and still no period. I'm currently between doctors since mine stopped practicing for some reason and haven't gotten into a doctor yet. I have taken several pregnancy tests, all of which were negative. I have no idea what is going on, can anyone help shed some light on my situation?