It's been two years

My fiancé and I have been trying to get pregnant for two years. I've went down two pant sizes, we both eat healthy, and we're young. I have PCOS, but have been pregnant before. I don't want to just run to the doctor. What are natural ways to help conception? Getting fit and healthy haven't helped, and neither has managing the PCOS. I'm at a loss. Is a doctor my only choice?