PCOS sufferer TTC

Caitlin
I'm 21 years old and me and my boyfriend (fiancé at some point this year) are trying to have a baby. Don't judge on our age please, we have everything in check. 
We wanna start early because I have PCOS and it's going to make it hard to conceive, so the sooner we can start the better. 
We been trying for a few months and we've gotten hopes but a test later crushes them. My doctor said that my blood work and sonograms look good for us making a baby but we're having trouble. 
Any advice on what we can do??
I started taking metformin 3 times a day again and I'm taking prenatals every morning. 
I was on birth control since 2009 up until May of 2015. 
Thank you ladies!