Is it considered menses if the brownish or yellowish discharge appears after purification during the customary period, and what is meant by "the customary period"? And is the prayer invalidated if some letters in Al-Fatiha are not pronounced with the correct Tajweed?

What a woman sees of yellowish or brownish discharge connected to menstruation and before seeing the sign of purity is considered menstruation. However, if it occurs after seeing the sign of purity, it is not considered menstruation, even if it comes down just hours after seeing the sign of purity, due to the hadith (definition) of Umm Atiyyah: "We did not consider the yellowish or brownish discharge anything after purity."

The cessation of menstruation is known by one of two signs of purity: dryness (complete dryness of the area from blood), or the white discharge (a white fluid discharged by the uterus when menstrual bleeding stops).