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I’m your period blood. My color changes—and each shade tells you something about your body. When I’m bright red, I’m fresh. Your flow is steady, and everything is moving as expected. When I’m dark brown, I’m older blood. It’s taken longer to leave your uterus. This is common at the beginning or end of your period. If I look pink, I may be mixed with cervical fluid. This can happen with lower estrogen levels.