No positive ovulation test?

Co

I am currently on CD 1 of our first <a href="https://glowing.com/glow-fertility-program">IUI</a> cycle. I have been reading that a lot of women aren’t getting positive ovulation tests while taking Letrozole? Every month that I have used OPKs I have gotten a positive but am now worried that I won’t. What are your experiences?? And any tips and tricks for our first time would be greatly appreciated! ❤️