Please help

Has anyone had problems with the depo shot?? My husband and I have been trying for almost a year and nothing!!!! I only got the shot once like 3 years ago I have a daughter from a previous relationship and we really want one together!!!! I have had a few ppl tell me they know ppl that has had problems after the depo shot so I was just wondering if anyone else has had the same problem..... Anything helps!!!!