Hi there! I have a similar story, except that I actually lost the weight and regained and lost again. (several times)
Although I do not have pcos, I did stay at the same weight for over a month, and what finally helped was to increase my calories by just a little bit and exercise just a little less. I am now kind of hovering and not losing, but I have not been logging and working out like I need to, due to school, so I can't blame that on anyone but me.
Some people find that with pcos they have to lower their carbs a lot more than others just to struggle to lose a single ounce. I don't know how many carbs you are eating, but that is one thing I see a lot with IR and pcos both.
Congrats on the weight loss you have kept off. That is still an accomplishment, and you should be excited! You can get there. You just have to keep going, mix it up when things get boring, or when you get stuck(You may be stuck right now).