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Follicle Stage

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

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