I was on depo from May-October of 2015 and was due for another shot January 3, 2016. I decided to not take it or get on another form of birth control because I was dealing with side effects from depo. Last month I bled for 5 days and my doctor said it was just abnormal bleeding. Now I just started again and its been 28 days and can't tell if it's a period since I've read about cycle and fertility delay also bad stories of no bleeding at all or fertility.