Is the blood that returned after stopping for a week considered menstruation or istihadah (non-menstrual vaginal bleeding), knowing that it coincides with the usual days of the period, and is it obligatory to continue praying?

Blood that returns within the forty-day period is considered nifas (postnatal bleeding), and anything beyond that is not nifas unless it coincides with the woman's regular menstrual period.

If the bleeding exceeds forty days, the woman is considered to be in a state of istihadha (non-menstrual bleeding). Any bleeding that coincides with her regular menstrual period is considered menses, and anything else is istihadha. Accordingly, yellow and brownish discharges interspersed with nifas blood are considered nifas until the fortieth day. Then, she should perform ghusl (ritual bath) and will be in a state of istihadha after the fortieth day, requiring her to perform ablution for each prayer.

When her regular menstrual period arrives, she should consider any bleeding that coincides with it as menses, abstain from prayer, and perform ghusl after the menstrual period has ended.