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What is 1 + 3?
First stage, egg is inside follicle and follicle grows. Estrogen thickens the lining of the uterus with blood
Second stage, egg leaves ovary and travels down the oviduct. About one day
Luteal Phase (corpus luteum phase)
Third stage, Corpus luteum secretes progesterone that keeps the lining of the uterus thick with blood. About fourteen days
Fourth stage, Brain tells body no fertilization has occured, progesterone decreases, lining of uterus sheds