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
2.
preceding gestation; before pregnancy
progestational in American English
(ˌproʊdʒɛsˈteɪʃənəl)
adjective
of or involving hormones that, in female mammals, precede, prepare for, or are active in ovulation and pregnancy