Is the pinkish blood mixed with brown streaks that appears four days before the menstrual period considered menstruation, or should one continue to pray and fast until the usual menstrual blood appears?

Pink, if it is light red, is considered menses if it persists for a day and a night. If it is yellow, it is not considered menses unless it is connected to a known menstrual period or occurs during the usual days of menstruation and lasts for a day and a night. What applies to yellowness also applies to brownish discharge. If it is determined to be menses, then it is obligatory to abstain from prayer, fasting, and other things that a menstruating woman abstains from.