One can imagine a like an analog
clock which at 0 o’clock the
beginning and the of the menstrual
cycle that 6 o’clock corresponds
the 14h day of cycle.

At 0 o’clock menses and so the
cycle begins and FSH
level begins to increase. 2
o’clock the maturing under FSH
action are secreting estrogen
and the is thickening.
Around 3 ’clock estrogen is intensely
stimulating increase of LH blood
. At 6 o’clock (the day) LH is
at maximum concentration and FSH
at high levels to ovulation,
LH then stimulates formation of the
corpus . Around 7 o’clock the
luteum is already secreting
great amount of estrogen
progesterone and the endometrium
even more, concomitant
lowering FSH and LH occurs the
increasing of the hormones.
Around 11 o’clock reduced LH and
FSH make the corpus luteum
into the corpus albicans, production
of estrogen and ceases
and the endometrium . At 0
o’clock again ( day) the
endometrium desquamates a new
menstrual cycle .