PCOS: terrified of infertility

I was diagnosed with PCOS at 18 and was devistated as I have always wanted to have children. I'm now 21 and engaged. We are not currently trying to conceive, but I am so scared I will never be able to carry a child. I can't stop thinking about it. The thought of having a miscarriage or not being able to get pregnant at all seriously makes me want to just crawl into bed and never get up and I'm so frustrated with not knowing what my outlook is, when I should start trying, what to do to help my chances (everyone is different so there isn't a ton of good info besides loose weight🙄). I just can't imagine never having a child with my future husband and I'm feeling so scared and sad right now ):