What is the ruling on intermittent bleeding and yellowish discharge after the usual days of menstruation, knowing that the period has become irregular and has exceeded ten days?

The maximum duration of menstruation is fifteen days. Any blood seen during a period that is suitable for menstruation is considered menstruation. Yellowish and brownish discharges (ṣufrah and kudrah) are considered menstruation during the usual period, but not otherwise, unless they are connected to blood. Upon seeing purity (dryness or white discharge), one must perform ghusl (ritual bath) and pray. If the yellowish or brownish discharge returns during the usual period, the woman is considered menstruating, and ghusl is obligatory after its cessation. However, if the yellowish or brownish discharge is seen after purity and outside the usual period, it is not considered menstruation.