If you bleed during pregnancy it's not menstruation. It can sometimes seem like it but it's not. And it's usually lighter. If you are menstruating however you can not be pregnant. You menstruate because the uterus is shedding the lining since no egg is fertilized and attached to it. When pregnant you do not release eggs and the uterus can not shed the lining since then you would have a miscarriage.
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