The return of the woman with irregular bleeding to her known custom

Question:
Honorable Shaykh, if it becomes clear to the woman, a day before, that this is istihadah (irregular non-menstrual bleeding) or that she is following a custom out of necessity, does she return to her custom or to the custom of necessity? For example, if the blood is

Answer:
The correct and established view is that she follows her custom; she follows her custom and considers what exceeds it to be istihadah (irregular non-menstrual bleeding). Yes.