Impact of Vaginal Microbiome on Vaginal Absorption of Exogenous Progesterone: a Pilot Study.

Vaginal samples will be taken. A floxed nylon swab will be rotated against the posterior vaginal wall, Nucleic acid extraction and genetic analisys will be performed

Intravaginal Ph value meassurement.

Determination of serum P4 levels On the day of embryo transfer scheduling (prior to the onset of exogenous progesterone administration) and on the embryo transfer day-.

Determination of serum E2 levels On the day of embryo transfer scheduling (prior to the onset of exogenous progesterone administration) and on the embryo transfer day.