Thanks Patrice! I thought that because Letrozole suppresses Estrogen which causes the body's natural FSH to rise therefore growing the follicles, the reduction in Estrogen could potentially impact the lining. But if it doesn't make any changes to the lining then that's good, thanks.
You are most welcome.
Letrozole is used for ovulation, I honestly dont think it makes any changes with the uterine lining. Any estradiol/estrogen related medications would be what causes uterine thickness for better implantation results.