~*HSC 4 life*~
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yeah it's called endometrium i thinkvirgin^sexy said:it actually isn't all blood
it's mostly made up of the insides of the uterus which form throughout the time when you AREN'T getting your period. it comes out because no egg has been fertilised because it doesn't need to act as a sort of cushion-y thing for the baby that would otherwise form.
i think.