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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.
Having a period does not mean that you have ovulated or will ovulate. In a condition called anovulatory cycle (having no ovulation), you will experience some bleeding which is often mistaken for period. This may be caused by decrease in estrogen level and buildup in uterine lining. 1  Getting Pregnant.