Help ...

Okay ladies, me & my fiancé have been trying to conceive for almost 11 months now. We've literally tried everything. We've turned to my doctor for help & he prescribed me progesterone, I've been taking it for about four months now & no luck. When we went back to him he just suggested taking prenatal vitamins. I'm starting to feel really discouraged & just feel like my doctor isn't really helping. Any advice here ?