Switching from clomid to letrozole??

We are starting cycle number 4 with <a href="https://glowing.com/glow-fertility-program">IUI</a>. For the last three cycles, we have done clomid, trigger, and <a href="https://glowing.com/glow-fertility-program">IUI</a>. We are switching to 10 mg of letrozole this month. Spotting started tonight to tomorrow is cycle day 1.

Has anyone switched from clomid to letrozole and had a successful <a href="https://glowing.com/glow-fertility-program">IUI</a> after switching? Please wish us luck as this will be our last cycle before we take a break until December.