1-5|, The uterus lining breaks down and passes out of the vagina. This is known as menstruation or 'having a period., 5-14, The uterus lining starts to build up again. An egg cell starts to mature in the ovary., 14, An egg cell is released from the ovary. This is called ovulation., 14-28, The uterus lining remains thick. During this time, the egg may be fertilised by a sperm cell., 28, f the egg cell is not fertilised by a sperm cell, the uterus lining begins to break down again and the cycle repeats.

Menstruation cycle

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