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Brown discharge is blood that has lost its hemoglobin
, which indicates that it is old. It also indicates that it was scant in amount because fresh bleeding will make its way down the vagina in its bright red state in moderate or large amounts.
Normal spotting is what may occur at the very end of your bleeding days. This is also known as post-menstrual spotting. In this case you are just "cleaning out" your uterus/vagina. This may be caused from the uterus not completely shedding the products of menstruation
, minor vaginal/cervical trauma during intercourse, hormonal
If new symptoms arise or this symptom recurrs next month you should consult your gynecologist.