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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.
Each month, the uterus is lined with blood to prepare for conception. If conception doesn't occur, the blood is released through the cervix. Brown vaginal discharge shows before regular menstrual blood when there is old blood left in the cervix from the previous cycle. Ovulation can cause brown cervical mucus. There are a couple of possibilities for why this occurs.