Pregnant but no ovulation?

So I had been having injections for 3 months to stop my period (After surgery as I have endometriosis). It’s been a while since my last one and my period still hasn’t come back.

As I’m trying to conceive (desperately!) I was advised to start trying again.

Now I have been trying since but I have no idea when I’m ovulating as I’m not having periods!

I went to GP - he said they can’t investigate why periods aren’t coming back until 6 months as it could just take time.

So my question is really, have many of you fallen pregnant when you were not ovulating?

I have been using the clear blue ovulation sticks - but I never seem to be ovulating!!

Really just don’t know if it’s worth to keep trying if I’m never ovulating.

Really could use some advice!