What is the ruling regarding the prayers I performed while I was impure, due to the emission of blood or a brownish discharge after seeing the brownish discharge that I thought marked the end of menstruation?

The brownish discharge (Kudra) during the menstruation period is considered menstruation, and performing Ghusl (ritual bath) before the end of menstruation is invalid. The prayers performed after that Ghusl are invalid and must be made up (Qada'). To determine their number, one should pray what is most likely the number of prayers performed in a state of impurity. The missed prayers should be made up according to one's capacity, in a way that does not harm the body or livelihood. However, if ignorance was the reason, some scholars hold the view that making up the prayers is not obligatory.