Is it necessary to repeat the ghusl after drops of blood are discharged following the ghusl from menstruation?

If the usual menstrual period has ended, then any yellowish or brownish discharge that appears is not considered menstruation, and prayer and fasting are valid with it. However, if the yellowish or brownish discharge occurs during the time of menstruation, then it is menstruation and prevents prayer and fasting. If these discharges recur every month after the cessation of blood, then ghusl (ritual bath) is obligatory. But if they are a few drops, do not recur, and are yellowish or brownish, then ghusl is not obligatory, and it is considered purity.