Help!! Contraceptive injection

Hey have any one previously been on the contraceptive injection and is struggling TTC?
 I was on the injection for 2 years, before me and my partner decided to come off it back in May 2015. I had my first period in December but still no positive result. 
Starting to feel like it will never happen, it's a year since I came off the injection. 
Have anyone else been on the injection and is TTC after it? Please help?