Is performing ghusl after seeing dryness valid, knowing that a brownish discharge and red blood appeared afterwards?

Turbidity seen after the sign of purity is not considered menstruation. However, red blood is considered menstruation if it occurs within the possible time of menstruation. Therefore, if the blood seen by the woman occurred within the possible time of menstruation, she must repeat the ghusl (ritual bath). If she is not certain about seeing blood, or if it occurred outside the possible time of menstruation, then it is not considered menstruation.