CM PROBLEM

Hello, I have some concern my RE wants us to do <a href="https://glowing.com/glow-fertility-program">IUI</a> because i have problem with CM it kills my Husband sperm so she said only way i can get pregnant is <a href="https://glowing.com/glow-fertility-program">IUI</a>. my husband SA is good. I did 1st round letrozole, I did ovulate but I didn’t get pregnant, Is there anyone here have CM ISSUE and taking LEtrozole but still concieved? What did you do?