i was on depo for i'd say november-february.missed february shot and had unprotected sex march.got my shot middle of march,it wore off middle of june did not get a period until september and my period was everyother day then i got it in october but it was like brown discharge what you get after a period and that was only for 3days and i havent seen it since could i have had an infection or something.help me please11/2008