Here is what someone wrote on that subject hope it helps
At the start of the menstrual cycle, oestrogen levels rise. This rise in oestrogen causes the endometrium (uterus lining) to thicken because it starts to receive a richer supply of blood.
About two weeks into the cycle, LH (Luteinizing Hormone) levels rise dramatically; this surge in LH triggers ovulation and also causes the follicle to become a corpus luteum.
This corpus luteum then starts to produce and release progesterone (it also releases small amounts of oestrogen).
Progesterone carries on maintaining the endometrial lining for a potential pregnancy; it also stops a new follicle developing and prevents the uterus from contracting.
However, if the egg does not fertilize then progesterone levels start to fall; the corpus luteum degenerates, the lining starts to break down/shed and the uterus can now contract which leads onto menstrual bleeding.
During ovulation, oestrogen levels are relatively low, but not absent. As stated above, the corpus luteum does release oestrogen as well, but only small amounts. It secretes larger amounts of progesterone than it does oestrogen, which is why progesterone levels are much higher during ovulation.
In short; progesterone is released from the corpus luteum during ovulation. Progesterone carries on maintaining the uterus lining, it stops a new follicle developing and prevents the uterus contracting. With no fertilization, progesterone levels fall causing the shedding of the uterus lining and menstrual bleeding.
Hope that helped