I need advice last June I got my first depo shot had my period for to months and then it stopped and changed my mind I wanted another baby so I stopped the shot Aug of last year. I haven't had a period sense. 2 days ago I got this light brown discharge that stopped this morning. I thought it was my period or just coming down from the shot but it didn't get worse. didn't leave a mark on a pad nothing. could it be implantation bleeding or something else.