A Normal Progesterone Estrogen cycle.

Cycle	Estrogen	Progesterone	Related Events
Day 1, Menstruation	Low	Low A few milligram(mg) per day	If pregnancy does not take place, the uterine lining is shed (menstruation), and another monthly cycle starts.
Day 3	Low	Low	GnRH from hypothalamus stimulates the pituitary to send follicle stimulating hormone to the ovary, initiating follicle (egg sack) maturation and thickening of uterine lining.
Day 10	Surge to high	Low	Mature follicle releases estrogen to promote thickening of uterine lining and to stimulate the pituitary gland's secretion of luteinizing hormone that induces ovulation.
Day 14, Ovulation	Medium	Starts to rise up to 30 mg/day	If ovulation fails, Progesterone is not produced.
Day 24	Drops to low level	Drops to low level	If the egg is fertilized, progesterone from ovary continues to rise. Any drop in progesterone level results in menstruation or miscarriage. Later during pregnancy, the placenta produces up to 3000 to 4000 mg/day of progesterone .
Day 1, menstruation	Low	Low	The drop in estrogen and progesterone level triggers menstruation as well as GnRH secretion in hypothalamus.
After menopause	estradiol: 15% of premenopausal level estrone: 40 to 50% of premenopausal level	Low	Estrogen still produced in fat, muscle and skin cells by converting androstenedione produced in the ovary and adrenals. Low level of progesterone still produced by adrenals and brain.

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