Normal menstrual period is 3-7 days, on the sixth day of menstruation there is brown discharge, this is a normal phenomenon, may be the uterine cavity or the vagina residual blood caused by, so there is no need to worry. If it clears up after the seventh day, with no bleeding and no brown discharge, it’s perfectly normal and there’s no need to worry. On the first day of your period, the amount of menstrual flow is low and the color may be brown or dark black. On the 2nd-3rd day is the normal bleeding time, the menstrual flow is heavy, usually dark red, some people bleed a lot may appear bright red. By days 4-5, it will have decreased significantly. By days 6-7, it may be a brownish discharge.