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Quick Answer. During a menstrual cycle, the blood may become dark red or brown near the end of the cycle because the blood is older and is not being released as quickly. This is a normal color change during a menstrual cycle, explains WebMD. Continue Reading.
Your period flow can be light, heavy, or in between. Sometimes menstrual blood also will be different shades of red, from light to dark. You may see some dark clumps or clots of blood, which is normal. Your period may be heavy the first day or so each time and then decrease on later days.