My periods have always been wacko! They used to only come every third month, them started coming every other month but would be super heavy and last for 4 weeks, so I got on the mini pill. Now they are pretty much non existent. I haven’t had a cycle in months. Is this normal?

I’m 31 years old, have PCOS, and while I am happy to not have a period, we do want one more baby in maybe a year or so, and I’m afraid of getting off the pill when it comes time. Will this screw my body up more?