506. If a Mubtadea, a Mudhtaribah, a Naisya, and a woman with the fixed habit of duration, see blood with the signs of Hayz, or are certain that the discharge would last for three days, they must abandon the obligatory prayers. But if they understand that it was not Hayz, they have to give the Qadha of the prayers they did not perform, but if she is certain that the discharge would last for three days and she does not have the signs of Hayz, as an obligatory precaution, she must perform the rules of Istihaza until 3 days and refrain from doing what is Haraam for Haaez, and if she is not Pak after three days, she must consider it as Hayz.
507. If a woman has a fixed habit of Hayz, either of time or of duration or of both, and if she sees blood for two consecutive months contrary to her usual habit in which her finds that the time, the duration or both coincide then she has formed a new habit. For example, if previously she saw blood from 1st to 7th of a month, but during these two months she saw it from the 10th to 17th, then the period from 10th to 17th of the month will be her new habit.
508. "One month" means the expiry of 30 days from the date of commencement of Hayz and not the period from the first to the last date of a month.
509. If a woman usually sees blood once in a month, but in a particular month she sees it twice with signs of Hayz, and if the number of intervening days during which she remained Pak is not less than 10, she should treat both as periods of Hayz.
510. If a woman sees blood with signs of Hayz for 3 days and thereafter for 10 or more, she sees blood with the signs of Istihaza ad again she sees blood with signs of Hayz for 3 days, she should treat the first and last bleeding as Hayz.
513. if a woman treats the blood she saw during certain days as Hayz and did not perform her acts of worship and comes to know later that it was not Hayz, she should give Qadha of the lapsed prayers, and fasts, which she left out. And if she performs acts of worship under the impression that the blood is not Hayz, but realizes later that it was Hayz, then the fasts kept in those days will be void and, therefore, she should give Qadha of those fasts.