What is considered the first down of a females reproductive cycle?

What do you mean by first down?

Explanation:

The oocyte, or unfertilized egg first leaves the ovary via fimbrea and enters the uterine tubes for ovulation. If the oocyte does not become fertilized and transition then to an ovum, then menstruation begins.

This is the process which the oocyte and lining of the uterus (endometrium) is shed! Where it passes through the cervix and exits via the vaginal canal

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.