The first day of a womans menstrual cycle is also the first day of menstruation.
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It varies from woman to woman; but the cycle is normally 27 - 32 days long. The period itself is normally 2 - 4 days.
The average menstrual cycle is 28 days. Five days for the menstrual phase (when a woman's endometrium is being expelled, also known as a period), nine days for the proliferative phase (when the endometrium is developing), zero days for ovulation (when a ripe ova, or egg cell, is deposited from an ovary), and fourteen days for the secretory phase (when the endometrium continues to develop.
28, I'm told, though in practice it seems to vary. 25-30 is probably a good bet.The average menstrual cycle length is 28 days - but there can be a lot of variation from one woman to the next, thus they can be shorter or longer.
Ovulation generally occurs between day 11 and day 21 of a woman's cycle.
Yes, a woman can get pregnant two days after the last day of menstruation. It all depends on her menstrual cycle as to whether she is fertile that day, but it is certainly possible if no birth control is used.