hi would just like some advice..

gave birth 2009 to a baby boy ... i have been on depo injection for 2 years coming off april 2013.. stil no period as of yet and its really getting me down. tried ovulating tests and all neg preg test all neg.. would love a baby borther or sister for my son but nothing as of yet... any advice to get my periods back dont want to wait as long as 1-2years like iv read about xxx