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1. Delayed Periods. â A brown vaginal discharge instead of a period usually occurs due to late periods. â Sometimes if the lining is not eliminated, the residual can remain within the uterus for almost a month. â In this condition, a womanâs body expels an old uterine lining.
Brown Discharge before period caused by implantation (implantation bleeding) Implantation bleeding and/or implantation brown spotting is an early symptom of pregnancy. It is an indication that the fetus has implanted itself in the uterine endometrial lining. While the fetus burrows itself inside the uterine lining, it leads to rupture of the lining.