I had unprotected sex 12/25/13. The same day I started spotting. Until last week 1/2014. I have a full period & I'm on Depo-Provera shot. What's wrong?

Irregular. One of the most common side effects of the depot Provera (medroxyprogesterone) shot is irregular bleeding... Sorry. Nothing may be wrong at all some women talk to their doctors and get put on a pill as well, while they are on the depot, to control for breakthrough bleeding, just an idea.