Ttc after Depo injection

Hi, I'm new to this app. 
I'm trying to concieve after the depo injection. I'm 10 months in and my periods are still very irregular and still very unpredictable, therefore I have no idea when or even if I'm ovulating!! I find this very stressful and upsetting. 
Just want to get any thoughts or feelings on ttc after depo injection and/or with irregular periods.
Thanks :) x