Is it obligatory to make up prayers missed due to delaying the verification of purity until after sunrise, believing it to be permissible, and not knowing the obligation to check for purity when the menstrual period is nearing its end?

A woman is obligated to monitor her purity at the beginning of each obligatory prayer. If a woman becomes pure after Fajr and she had verified her purity during the night, she does not have to make up the prayer unless she is certain that purity occurred at its proper time.

If a menstruating woman becomes pure before sunrise by the duration of one takbiratul-ihram, she must make up the Fajr prayer after performing ghusl. If she becomes pure before the appearance of Fajr, she prays Maghrib and Isha. If she becomes pure before sunset, she prays Dhuhr and Asr together according to the majority of scholars.