DEPO INJECTION

Jess
I'm so depressed. I was on the depo injection for 4 years. I got married in September 2016 and came off the injection October. It's been 8 months and no period. All I have ever wanted in life is to be a mum! 
So I took the pill for a months course and got my period at the end. YAY!! 
Then I believe I ovulated as I had a lot of EWCM
I tested on DPO10 - negative. Had a lot of cramps that day. Thought my AF would start. Nothing. 
Now I'm worried that my body has just gone back to sleep again from the injection. I just want regular periods to get started. 
Anyone else been on the DEPO injection that can offer any advice?? It takes so long! 😥😥😥