Can you have PCOS and not be overweight? I see this listed as a symptom when I've googled it, but I'm wondering if it's possible without that symptom.

I am not overweight, actually very skinny and have never had weight issues (not bragging, just trying to talk about symptoms here). Before I went on birth control when i was about 17 i had VERY sporadic periods, once every 6 to 12 months from age 13-17. I have never been off BC since then (now 26).

We are hoping to start trying early next year, so I have plenty of time, but I had originally planned on going off BC about 3 months in advance. Should I go off earlier to test to see if I still have sporadic periods and perhaps PCOS?