Do the light discharges on the fifth day, three days after the menstrual period, necessitate ghusl, prayer, and intercourse, and is the light blood that follows considered menstruation?

If a woman sees purity by one of its two signs (dryness or white discharge), then she becomes pure, performs ghusl, prays, and it is permissible for her husband to have intercourse with her. If the blood returns at a time when it can be considered menstruation, then she reverts to being a menstruating woman, and she must perform ghusl after the cessation of this returning blood.