07bb742a_l_progesterone_estrogen_cycle___Progesterone
[Cycle] Day 3 [Estrogen] Low [Related Events] GnRH from hypothalamus stimulates the pituitary to send follicle stimulating hormone to the ovary, initiating follicle (egg sack) maturation and thickening of uterine lining. [Progesterone] 
Low
Normal progesterone estrogen cycle.
Progesterone