The menstrual cycle is the monthly release of an egg from a womens ovaries, and the build up and breakdown of the protective lining in the uterus.
Stage 1- The uterus lining starts to break down for about 4 days.
Stage 2-The lining of uterus starts to build up again, from day 4-14 it forms a thick layer of blood vessels, which are able to receieve a fertilised egg.
Stage 3-An egg is released from the ovaries at day 14.
Stage 4-The Lining of the uterus is maintained for about 14 days, until the 28th day. If the egg is not fertilised then the lining breaksdown again, and the cycle begins again.
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