Trying with unpredictable cycles :(

Britney
Hey ladies!
I was on the depo for about 8 months and had my last shot August of 2015. I bled constantly from January 2015-March 2016. 
I had a sonohyst that showed no abnormalities and confirmed that my body is still ovulated (we just can't track when). 
I'm now bleeding anywhere from 3-6 weeks at a time with about a 2 week break. 
We desperately want to try to get pregnant but I have no idea how to even begin to try without being able to track my cycles because they are so irregular. We haven't used any protection since December and haven't gotten pregnant. 
Doesn anyone have any advice or wisdom you could pass on?? Everyone around me seems to be getting pregnant and to be honest it sucks a little. 
Help!