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Each month, from the age of about 12, a woman releases one egg each month. If this egg is fertilised by sperm during sex, a baby is made. If it isn't fertilised, it starts to break down and the body needs to get rid of it. Also, during the month, the lining of the woman's uterus/womb starts to build up and thicken so that if the egg is fertilised it will be able to implant into the lining and grow. If the egg is not fertilised, the body also needs to get rid of this built-up lining. So, once the egg has been released, and not fertilised it will start to break down and the remains leave the uterus through the cervix and out of the vagina. As the lining of the uterus starts to break down and detach, blood vessels are ruptured and this is where the blood comes from.

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7y ago
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12y ago

Because when they are pergnant the blood goes to the baby.

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