Assessing the Convenience of Natural Proliferative Phase Frozen Embryo Transfer

When endometrial thickness is above 7 mm, vaginal micronized progesterone will be administered 400mg 12/12h when the dominant follicle is at least 13 mm, serum estradiol (E2) levels are \>80 pg/ml, and serum progesterone levels are \<1.5ng/ml. Embryo transfer will be performed on the fifth day of progesterone.