This is actually great news! Better to have a Dx than no Dx. And you're doing everything right. I'm sure if your doctor is savvy enough to prescribe Metformin for you, then she/he also gave you the spiel on diet & exercise. Use these boards for support -- it's hard, but diet, exercise, and Met are the best treatment for us. A lot of us find that a South Beach-style way of eating is best, even when insulin resistance isn't involved (I'm in the same boat -- no IR, but on Met, and living a South Beach lifestyle

) because it's a sustainable way of dropping weight and keeping it off. Read up on low-glycemic index if you're not already aware.
As far as TTC, I don't know much about that since I'm not there yet. But there are plenty of successful stories of PCOSers getting pregnant, especially with Metformin as a treatment!! And if that doesn't work, there are other drugs that can help (I'm not the one to ask about those).
I remember when I was first diagnosed (at age 14), and then after years was in denial about it because I wasn't being treated properly, and then being re-diagnosed ten years later...it's not easy. But always keep in mind, this disease is totally manageable, and it could be much worse. I'm not saying I'm happy to have PCOS, but I think I'm making healthier choices because of it, which will pay off in the long run.
Best of luck. This forum is a terrific resource for all of us!! Keep us updated!