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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.
If your menstrual flow is of average volume it is probable that you may have some actual blood clots. These clots are usually quite small and typically dark red to almost black in color. The clots are small because there is only a moderate amount of blood lost that needs to clot. The clots are dark in color because the blood has been sitting in the uterus for awhile before it comes out in your menstrual flow. If you are having a heavy menstrual flow your blood clots will appear very different. First of all these clots will be bigger because there is a larger amount of blood sitting in the uterus that needs to clot. Secondly, these clots are usually a much brighter red.