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In the beginning of the menstrual cycle, LH and FSH stimulate the ovaries to make estrogen.  During this time, there is a negative feedback loop, so levels of all three hormones are rather low.  Eventually, as the estrogen levels slowly creep up, there comes a time when it switches from negative feedback to positive feedback (not exactly sure what the biochemical basis of this is), and LH and FSH levels skyrocket (estrogen levels go up to, but not as sharply, and there is always more LH than FSH).  The LH surge causes ovulaton.  The corpus luteum starts secreting progesterone, which inhibits LH and FSH secretion in a negative feedback manner, and so FSH and LH levels drop sharply.

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