Letrozole + Estrace = ?

I’m saving up for my 4th and final egg retrieval for <a href="https://glowing.com/glow-fertility-program">IVF</a> in December. Between now and then, my ob/gyn agrees with me to continue to try until then. I’m on 5mg cd3-7 and then 2mg Estrace 3X a day for cd8-12. I won’t have a trigger shot and only using OPK and follow up progesterone blood work for confirmation of ovulation. I understand estrace for clomid but anyone prescribed for use with Letrozole?