I currently was on depo since I was 17 and I'm now 20 and haven't had a period since. I was off depo for a year then decided to go back and get the shot earlier this year I think it was April or May. I haven't tooken any birth control since. Today August 16,2016 I noticed the transition in to the beginning of me starting my period again (brown) blood spotting is it possible for me to be pregnant?