A typical menstrual cycle lasts 28 days. It begins with three to five days of menstruation, the shedding of the uterine lining, during which hormone levels are low. At the end of menstruation, a pituitary hormone stimulates new follicles to develop in the ovary. These secrete estrogen as they mature, causing cells in the lining of the uterus to proliferate. Mid-cycle, one mature follicle releases an egg.
The empty follicle forms the corpus luteum, an endocrine body that secretes progesterone. Under the added influence of progesterone, the uterine lining thickens further and swells in preparation for the implantation of a fertilized egg. If fertilization does not take place, the corpus luteum dies and hormone levels fall. Without hormonal support, the uterine lining disintegrates and discharges, beginning a new menstrual period and cycle.
Summary of the cycle
Menstruation – Day 1,2,3,4,5
Safe – Day 6,7
Fertile from now – Day 8,9,10,11,12
Highly fertile – Day 13,14,15
Danger Period – Day 10,11,12,13,14,15,16
Late safe days – Day 17,18,19,20,21,22,23,24,25,26,27,28
This is not accurate but only an assumption for a woman whose menstrual cycle lasts 28 days.
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