Are the days on which bleeding returns after purity and ritual bathing considered days of menstruation, or vitiated blood during which prayer and fasting are permissible, given prior ignorance of the correct sign of purity, and that the current menstrual period does not exceed eleven days?

Purity from menstruation is recognized by two signs: the discharge of the white (vaginal) fluid, or the occurrence of complete dryness such that the cotton swab comes out clean. One should not rush to perform ghusl until purity is confirmed, as evidenced by the actions of the Mothers of the Believers.

If purity is confirmed and the woman performs ghusl, then blood returns on the thirteenth or fourteenth day:

If the blood is in the known characteristic of menstrual blood (black), then it is menstruation as long as it does not exceed fifteen days. If it exceeds this, then she is considered a mustahadah (experiencing prolonged vaginal bleeding) according to the majority of scholars. If the blood discharged after purity is red, like wound blood, and not in the characteristic of menstrual blood, then it is istihada and does not prevent prayer, fasting, or intercourse. As for brownish or yellowish discharge after purity, it is not considered anything and does not prevent prayer or fasting.

It is advised to seek refuge from whisperings (waswas), for whenever the known black blood is present, it is menstruation; otherwise, it is istihada. If the distinction becomes mixed, the woman should rely on her known habit (nine or ten days), and anything beyond that is istihada. If the bleeding stops and the area dries, she should perform ghusl.