progestational

prepared for pregnancy, as the lining of the uterus prior to menstruation or in the early stages of gestation itself; progravid.

of, noting, or characteristic of the action of progesterone; inducing a progravid state.

of or relating to the phase of the menstrual cycle, lasting approximately 14 days, during which the uterus is prepared for pregnancy by the secretion of progesterone from the corpus luteum

preceding gestation; before pregnancy