Menstruation or menstrual period is a woman's monthly bleeding when she has ovulated and is not pregnant.
When a woman menstruates, her body is shedding the lining of the uterus (womb). Menstrual blood flows from the uterus through the small opening in the cervix, and passes out of the body through the vagina. Most menstrual periods last from three to five days. A menstrual cycle is counted from the first day of one menstrual period to the first day of the next period.
How to calculate your next menstrual cycle period:
The average menstrual cycle is 28 days long.Cycles can range anywhere from 21 to 35 days in adults and from 21 to 45 days in young teens.
An estimated menstrual cycle period can be calculated by following steps 1 through 3: