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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.
Dark brown discharge is a symptom of âold bloodâ and/or old uterine lining which did not left the uterus at right time (during regular menstrual period). Often the dark brown discharge is just remains of delayed period â most often associated with old endometrial tissues (remains of last period).ark brown discharge instead of period could be early signal of pregnancy â so called âimplantation bleedingâ. After the fertilization occurs the fertilized egg or zygote travels down the fallopian tube to the uterus â during this journey the cell division takes place and the zygote develops into an embryo.