What do oestrogen and progesterone do in the menstrual cycle

Oestrogen is involved in repairing and thickening the uterus lining, progesterone maintains the uterine lining.

Oestrogen and progesterone in the control of the menstrual cycle. Progesterone maintains the uterus lining (the thickness of the uterus wall). If the egg has not been fertilised, the corpus luteum dies and progesterone levels drop. This causes menstruation, where the uterus lining breaks down - this is known as having a period.