TTC With No Luck

Well me and my husband been trying to conceive for the past year and some months now and we've had no luck.Im 28 years old and Iwas on the depo shot for 2 and a half years and was last injected June 30,2014.I was wondering if anyone else was on the shots and decided to get off them to plan a family and how long afterwards did it take to become prego??Just curious.