What hormones cause a thickening of the endometrium to prepare for pregnancy?

PROGESTERONE and ESTROGEN. Under the influence of Hypothalamus, Pituitary gland starts secreting the hormone Follicle Stimulating Hormone (F.S.H.) after menses. Witch stimulates few follicles from Ovaries to enlarge. These in turn secretes the hormone Estrogen, witch brings about the changes in Endometrium (Inner wall of Uterus.)called Proliferative stage. Usually on day 14 of menses, Follicle ruptures under the influence of Leutenizing Hormone from Pituitary gland , liberating Ovum in Peritoneal cavity. Witch is taken up by Fallopian tube and if fertilized, get embedded in Uterus on day 8, usually. After rupture of Follicle it becomes Corpus Lute-um.(White body.) Witch secretes the Hormone Progesterone as well as Estrogen. Unruptured Follicles also continue to secrete Estrogen. Together they bring about the change in Endometrium for implantation of Fertilized Ovum by making it thick called as Secretary stage.