*Depo-provera* Why am I not pregnant yet? Should i be worried?

I've done endless amounts of research, can't really find the answers I'm looking for so I figured I'd give this a shot!

I was on the shot for 5 years, and my last shot was July of 2016. I haven't used any condoms, I don't do the pull out method nor have I been on any form of birth control.

My periods are regular now, I've used this tracker for a while and it's been dead on almost every single time for atleast 7 months now..

I was also an addict from August of 2016 up until January of 2018, could that possibly have any effect on my fertility? I'm worried, I'm not trying to get pregnant, but I'm not necessarily not trying either.

I do want kinds in the future, but the fact that I haven't even had a scare in the past 2+ years, worries me.

Any tips or advice on what I should do? Thank you so much in advance ladies, you're all amazing. 💕