Tell me what is the relationship between ovulation, fertilization, and menstruation mechanisms?

Hard in 400 characte. Ovulation if cycles are normal occurs cycle day 14 or so. The ovulation site, corpus luteum, produces Progesterone and estrogen. Fertilization occurs with 24 hours of ovulation or pregnancy will not happen. Sperm last 48+ hours. If no pregnancy hormone levels drop day 28 and endometrial (uterine lining) breaks down and menstruation occurs. The developing egg makes estrogen that heals lining.