A woman whose menstruation lasts a known number of days

Sulayman said: I asked Ibn Sirin about a woman whose menstruation lasts a fixed number of days but sometimes exceeds them: what should she do? He said: Women know this matter better.

He (Sulayman) said: I asked Qatadah about this and said: If a woman's menstruation lasts a fixed number of days and then exceeds that by five days, what should she do? He said: She should pray. I said: And if it exceeds by four days? He said: She should pray. I said: And if it exceeds by three days? He said: She should pray. I said: And if it exceeds by two days? He said: Those are days of her menstruation. I think he said this from his own opinion.

Tawus said: If a woman's menstruation exceeds her fixed period, she should take a ritual bath (ghusl) and pray.

Hammad said, concerning a woman whose bleeding goes beyond the days of her menstruation: She should not take the bath of purification, for this sometimes happens to a woman.

Sayyiduna Uthman bin Abi al-As (may Allah be pleased with him) said: If a woman sees yellowish discharge outside the days of her menstruation, then if it exceeds her menstrual days by one or two days, she should count it as part of her menstruation. If it exceeds by more than two days, she should count it as istihadah (non-menstrual bleeding). If her menstruation is six days and she sees blood for eight days, she should count it as menstruation; and if she sees blood for more than eight days, she should count it as istihadah.