What is the ruling on seeing a brown discharge, like menstrual blood, after performing ghusl following menstruation, with a small amount of white discharge?

Brownish discharge after seeing the clear discharge of purity is not considered menses unless it is connected to blood or occurs during the period of one's regular menses. If it occurs outside the time of one's regular menses, do not pay attention to it, and you are required to perform istinja' and wudu for prayer. However, if it occurs during the time of one's regular menses, then it is considered menses, and you must perform ghusl after it ceases.