I wanna get pregnant but I have pcos πŸ’”πŸ˜”

Carson β€’ TTC since beginning of 2016. Finally had my little miracle 08/29/18. PCOS.
So I've been on birth control for about.... 2 months now. Going on my third month tomorrow. My doctor told me that should straighten everything out bc I hadn't had my period for 7 month but I'm getting it again! πŸ˜ƒ how long do I have to stay on my birth control?? I wanna start trying to have a baby but I don't want to get off of it too soon. PLEASE HELP