ONE depo shot

Jaelynne
I got only one depo shot last September, i was due for a new one in December and didn't get it.. So I only had one! 
I haven't had a period since December (had regular periods the whole 3 months on the shot) .. And now nothing! my husband and I are trying for a baby.
I find it hard to believe that only one shot could have messed with my cycles that bad? 
any other ladies out there who only had one shot??