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Every month, the uterus prepares for the possibility of pregnancy, so if nothing happens, the uterus sheds the lining and passes out of the body.
The uterus has a lining of blood in it. When the unfertilized egg passes through the uterus it sheds this lining which causes the blood to come out.
When you get your period it is uterus blood. Your period is the uterus shedding its lining if you do not get pregnant. All month your uterus builds up its lining for if your egg gets fertilized, and when/if it does not get fertilized, you have your period at the end of the month.
endometrium
Your period should have blood clots. Every month the uterus prepares itself for pregnancy. If a woman does not conceive, the lining of the uterus comes out (period). It is a cleansing process that happens every month.
The lining of the uterus gets thicker each month, in preparation for the growing Fetus.
That happens every month when you menstruate or if you've had an abortion and it comes back every month. And yes, you can because the sperm fertilize the egg in the fallopian tube, not the uterus.
Every month the uterine lining is prepared for the pregnancy. Every month it is shed up. Changing of the lining is routine phenomena all over the body. The pregnancy is supposed to be the most precious lining. You can not expect the nature to use the same ling for years together, when the fresh one can be made available easily.
If you are referring to menstruation, they do not bleed from their 'butts'. The blood is the thickened lining of the uterus detaching and falling out. This happens once every month if the woman does not become pregnant as the Uterus lining grows to give a resting place for a fertilised egg to become a foetus and then a baby. If the egg is not fertilised by sperm following sex, the lining of the Uterus is not needed and is rejected by the body.
Every woman has eggs in her uterus. When your hormones start to develop, once a month an egg goes down into the uterus and a blood lining starts developing. Your body is practicing having a baby in you. When your cycle is complete, the blood lining and egg flow out the vagina.
It builds up in preparation to receive a fertilized egg and allow it to imbed and begin to grow.