Pregnancy please help!!!

Well I been trying to get pregs for about a yr now but have not been able to. I am really scared im not going to be able to be a mommy and thats one of my biggest dreams. What should i do? or take? I went to a doctor and he told me I am able to be a mom so im not sure what I am doing wrong :/. And im married and my husband is also wondering why we havent been able to. Any advice or tips?