What is the ruling concerning the blood that a woman experienced after miscarrying a fetus whose creation was not yet discernible, given that the expulsion of the fetus coincided with the time of her menstrual period, and then the bleeding recurred after it had stopped? And is this blood considered menstrual blood that prohibits prayer, or is it irregular bleeding (istikhadah)?

The blood that follows a miscarriage before eighty days is not considered lochia (nifas (definition)). If the blood appears during her usual days and has the characteristics of menstrual blood, then it is considered menstruation (hayd). However, if the blood stops for two days and then returns with the characteristics of menstrual blood, then the two days during which the blood stopped are considered a period of purity (tuhr), and the blood that follows is considered menstruation.