Why won’t my follicles grow?

Molly

I am preparing for my 3rd <a href="https://glowing.com/glow-fertility-program">IUI</a>. Went in for my mid cycle ultra sound only to be told my follicles haven’t grown from the my baseline scan. This is after I completed a course of letrozole and gonal f. They have now increased my letrozole dose and I go back in for another scan in a week. Praying that these follicles will grow. I am getting so discouraged after every negative. Any advice?