what are the stages in a normal menstrual cycle ?!

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The ovaries consists of many follicles which release hormone, estrogen. into the bloodstream. Estrogen causes thickening of the endometrial lining of the uterus. That is the start of preparation of endometrial bed
After 14 days one most mature follicle of ovary burst and release an egg, known as ovulation.

The follicle from which the egg comes out becomes the corpus luteum, it produces the hormones estrogen and, in larger amounts progesterone which is necessary for the maintenance of bed of endometrial lining in uterus to receive fertilized ova.
If fertilization and implantation do not occur, Secretion of hormones are stopped and the surface lining of bed is shed and, known as periods or menstrual flow.
it takes 28 days

doctor

The menstrual cycle, under the control of the endocrine system, is necessary for reproduction. It is commonly divided into three phases: the follicular phase, ovulation, and the luteal phase; although some sources use a different set of phases: menstruation, proliferative phase, and secretory phase.[2] Menstrual cycles are counted from the first day of menstrual bleeding. Hormonal contraception interferes with the normal hormonal changes with the aim of preventing reproduction.

http://en.wikipedia.org/wiki/Menstrual_c…