Is light-colored blood, which only appears when wiping the outer vulva with a cotton swab after the usual five days of menstruation, considered menstruation or not, and does the duration of menstruation change as a result?

Whatever blood a woman sees during the possible time [of menstruation] is considered menses. A woman knows purity by one of two signs: dryness (the cotton comes out pure), or the white discharge. Purity is not achieved merely by the cessation of blood flow; rather, it is necessary to verify that the area is completely free of blood, yellowish discharge, or brownish discharge.