Better pregnancy outcomes in women with day 2 or day 3 fresh embryo transfer when progesterone supplementation for luteal phase support is initiated on the day of oocyte retrieval

Women undergoing day 2 or day 3 ET appear to have better pregnancy outcomes including clinical pregnancy, livebirth, and implantation rates when LPS was initiated on the OR day than those undergoing LPS initiated 1 day after OR, particularly for women with DOR. However, in the day 5 e-SET group, clinical outcomes are comparable between the two initiation time points.