How a woman distinguishes between menstrual blood and irregular bleeding

Question:
How does a woman distinguish between the blood of her customary or continuous period and the blood of irregular bleeding?

Answer:
If she becomes pure from her menstruation and then experiences yellowish or brownish discharge, that is irregular bleeding. If the blood occurs during the time of her custom, it is menstruation, even if it is yellowish or brownish, provided it comes during the time of menstruation. If her menstruation continues, and her custom was seven days but it continued until ten, there is no harm in her sitting [i.e., not praying]; it is obligatory for her to sit, not pray, and not fast. She leaves off the prayer because the custom increases and decreases up to fifteen days, with fifteen days being the maximum. So it increases and decreases. If her custom becomes seven days, and then it increases in some instances and she sees blood for eight, nine, or ten days, there is no harm. She does not pray, does not fast, and her husband does not approach her.
As for if she becomes pure from her menstruation and then sees yellowish or brownish discharge on the days of purity, there is no obligation upon her; she prays and fasts, and there is no obligation upon her. , and based on the saying of Umm Atiyyah (may Allah be pleased with her): "We did not count yellowish or brownish discharge after purity as anything." Umm Atiyyah was a Companion who said: "We did not count yellowish or brownish discharge after purity as anything," meaning: only ablution is required. Yes.

The presenter: Praise be to Allah. May Allah reward you with good and do you good.