Three Hormones At Their Peak All three hormones (LH, FSH, and progesterone) can not be found at their highest levels at the same time. Only FSH and LH can be found peaking in the same day. Progesterone …show more content…
Estrogen is made in the ovaries from the presence of both LH and FSH. Estrogen is used in near the beginning of the cycle, after menstruation, to start creating the uterine lining and the uterine cells. Uterine cells are used a part in the uterine lining and help expand the thickness of the lining. Estrogen is also used to help increase the amount of blood flow to the uterine lining. The addition of uterine cells, tissue, and blood flow create the lining. The cells are largest several days after the peak is because they keep growing after the peak, still using the estrogen. The uterine lining continues to grow using the estrogen, but the uterine cells do not use the progesterone to keep