What is the ruling on a woman's fasting and prayer if her menstrual bleeding stopped after using stimulating pills, then she began to suffer from side effects from these pills, and she expected withdrawal bleeding after stopping them?

If the bleeding continues for fifteen days or less, it is all menstruation (hayd). If the bleeding recurs after stopping the pills, with an interval of thirteen days or more, it is a new menstruation. If the interval is less than thirteen days, it is irregular bleeding (istihada). A menstruating woman (ha'id) does not pray or fast, and she must make up the missed fasts. A woman with irregular bleeding (mustahada) performs ablution for each prayer, and she prays and fasts.