The menstrual cycle begins Day 1 of your period, about half way through the cycle you ovulate and the last day is the day before your next period starts. Day 1 begins the cycle all over again. The last day of your cycle tells you the length of your cycle, on average between 24 and 34 days, although longer and shorter cycles are still "normal".
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The shedding of the uterine lining during menstruation marks the end of one menstrual cycle. The beginning of a new menstrual cycle is considered to be the first day of menstruation.
The shedding of the uterine lining, known as menstruation, marks the end of one menstrual cycle and the beginning of a new one.
The shedding of the uterine lining (menstruation) marks the end of one menstrual cycle, while the release of an egg (ovulation) signifies the beginning of the next cycle.
menstruation
you count day one as the first time you start bleeding...the last day is too hard to pinpoint because of spotting occurs after you have in actuality stopped. Usually a cycle is 3-7 days depending on the individual and heaviness of the menses.
At the end of a menstrual cycle, the unfertilized egg is either absorbed by the body or expelled during menstruation. The lining of the uterus, which thickened in preparation for a possible pregnancy, sheds as menstrual bleeding. This marks the start of a new menstrual cycle.