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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.
Period Problems. Having a regular menstrual cycle is usually a sign of good health. When you have a late period or missed period it could be a sign that something is up. There are many different reasons for late periods but if the problem continues for more than one menstrual cycle, make an appointment with your doctor to discuss the issue.