What is a pireod?

A pireod is when a girl is 12 or 13 and blood comes out of her vagina. why this happens is because her womb already has many eggs that the male needs to fertilize and at this age an egg drops. this tells the womb that its time to clean the egg out. this will happen till yer pregnant and lasts a week. it will happen once a month. when this happens use a pad or just in case a "maxi-pad". hope this helps!