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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.
Ovulation 101: 10 Common Questions about Your Period. 1  If the menstrual blood is dark red or black, does it mean there is something wrong? No, the color of the menstrual flow is not significant. The darker blood simply means it has been more broken down , or metabolized, before it comes out. On the other hand, bright red blood means the bleeding is more fresh. If I am stressed about my period, will it come late? It is true that stress can delay ovulation. But the stress has to be in the first half of the cycle in order to push back the ovulation date.