Why??

I want to be pregnant so bad... Me and my husband have been trying for a long time.. every time I see a picture of a positive pregnancy test I burst out crying I really want one so bad. I'm about to give up. See my husband is fertile, my doctor has told me I'm fertile. But, I have a gene that runs in my family that makes the woman very fertile but can't ever have a kid. My cousin and her boyfriend of 8 years has been trying for 6 years and hasn't had one positive test yet.. I just hope I don't have that gene.. I want to have a baby soooo bad.