Is the blood that comes down as a result of forgetting a birth control pill considered menstruation or istihadah (non-menstrual vaginal bleeding), knowing that the menstrual period ended at the beginning of Ramadan?

If blood appears due to stopping birth control pills, it is considered istihadah (non-menstrual vaginal bleeding) and not hayd (menstruation), because it occurred during the period of purity. Therefore, it is permissible to fast and pray with it, and the woman is not required to make up for the fast.