Pcos is a relatively newly discovered syndrome. It has alot to do wwith the endocrine system, and it's a wise idea to see an endocrinologist to help with the treatment. The polycystic ovaries are one manifestation of this syndrome.
Anyways, there's a very excellent website that talks an awful lot about it, offers support, gives resources to find doctors, etc it's:
http://www.Pcosupport.Org/
it will say more than I can in one post.
But are you concerned that you're pregnant because you've not had a period it a long time? Also I just re-read your post and your doctor making that assessment while you were 12 or 13 suggests to me to get a second opinion, that's awfully young to know "for sure" about something like pcos.