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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.
Best Answer: Dark, chunky clots of blood can be perfectly normal. Many women get them during their menstrual period when they have days of heavy cramping and heavy bleeding. Your body usually makes things called anti-coagulants, that keep your blood from clotting as it moves to your vagina and out of your body.