2 rounds letrozole one cycle?

Jenn • TTC 5 years and 6 Cycles for #1 . Unexplained infertility. All tests for DH and I are great. We are moving on to #IVF. Any advice welcome!

Has anyone ever heard of this or had success? I am starting my second round of letrozole this cycle. I have 3 immature follicles that they are hop8ng to help getting moving. I completed first round of letrozole CD 10. Currently CD 17 and starting another round.