Various rules related to Hayz

506. If a Mubtadea, a Mudhtaribah, a Nasiya 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 later understand that it was not Hayz, they have to give the Qadha of the prayers they did not perform.

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 she 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 or more days and thereafter for 10 or more she sees blood with the signs of Istihaza and again she sees blood with signs of Hayz for 3 days, she should treat the first and last bleeding as Hayz.

511. If a woman becomes Pak before the expiry of 10 days and feels that there is no blood in her interior part she should do Ghusl for the acts of worship although she may have a feeling that blood might appear once again before the completion of 10 days. And if she is absolutely sure that she will see blood before the lapse of 10 days, even then, as a matter of precaution, she should do Ghusl and perform her Ibadaat, but she will refrain from doing those acts which are forbidden to a Haaez.

512. If a woman becomes Pak before 10 days but feels that there might be blood in her interior part, she should insert cotton and wait for some time to find out. If she finds out that she has become Pak she should take bath and perform her acts of worship.
And if she finds out that she has not become Pak totally, and she does not have a fixed habit of Hayz or if her habit is 10 days, or if she has a fixed duration which is not yet completed, then she will wait. If she becomes Pak before ten days, she will do Ghusl. If she becomes Pak on completion of 10 days, or if her bleeding exceeds ten days, then she will do Ghusl at the end of tenth day.
And if her habit is for less than 10 days, and she is sure that the blood will cease before ten days are over, or by the end of the tenth day, she must not do Ghusl till then. And if she has a feeling that her bleeding might exceed ten days, it is a recommended precaution that she avoids acts of worship for a day, or upto the tenth day. But this rule applies to those women who have had continuous bleeding before the days of her habit. Otherwise, it is not permissible to neglect Ibadaat after the days of habit are over.

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 realises later that it was Hayz, then the fasts kept in those days will be void and therefore she should give Qadha of those fasts.