Periods are evil. They are spawns of Satan, quite literally. Satan ghost fucks us every month without our knowledge and tries to impregnate us because he wants Satan Jr. But the Satan sperm is so evil and supernatural that our body resists the change and bleeds out all the semen and the eggs. So that Satan wouldn’t be able to impregnate us for another month. That’s why when we actually get pregnant we don’t get periods because Satan can’t put his satanic semen in our eggs anymore.