What is the ruling regarding my prayer and fasting when I experience intermittent brown discharge followed by blood for a period of up to 12 days, knowing that this is the nature of my menstrual cycle?

"Kadrah" (brownish or yellowish discharge) not preceded by blood is not considered menstruation. If the discharge of blood spots and the "kadrah" connected to them continues for a day and a night, it is considered menstruation; otherwise, it is not. It is stipulated that the total number of days of bleeding and the interspersed periods of purity should not exceed fifteen days.