I'm 16 & I been on the depo shot for almot two years in January. I haven't had sex for a year & 2 months. But I recently had sexual intercourse on Sept. 14, 2013 & every since I have been spotting. Then I had sexual intercouse on Sept. 23, 2013 & now I'm having intense pain & spotting. & I havent had bleeding since the very beginning of my shots. I'm very concerned. & I would like to have some answers.