What is considered to be the blood that came down two days before the end of the forty (days) after childbirth, and what should a woman do if the bleeding continues after the forty (days)?

The blood that returns within the forty days after childbirth is considered nifas (definition) (postnatal bleeding). Whatever appears after the forty days is considered istihadha (irregular vaginal bleeding), unless it coincides with the woman's usual menstrual period, in which case it is considered menstruation (hayd).

If the blood coincides with her usual days of menstruation, the woman should wait until those days end, then perform ghusl (definition) (ritual purification bath) and pray. However, if it does not coincide with her usual days of menstruation, then it is istihadha, and she should have performed ghusl after the forty days ended and then do what a woman with istihadha does.