My fiancé won’t let me try Letrozole

After 8 months of trying and all tests coming back normal, my doctor decided to put me on Letrozole. Fiancé says he doesn’t care how long it takes, even if it’s 5+ years, he doesn’t want a Letrozole baby. I’ve been crying all night. I would have agreed on a year, but the fact that he never wants to try anything other than normal (which has failed us for 8 months, I should also mention that I’ve been off birth control for almost 3 years now and we’ve never gotten pregnant)

What would you do? I feel like giving up on everything, including us. He doesn’t get how hard this has been on me.