What is the ruling on the small amount of blood that a woman experiences a day or two before childbirth, knowing that the time of birth is clearly approaching?

Blood is an impurity that must be purified from the body, clothes, and place, unless it is a small amount not reaching the size of a dirham, in which case it is excused by some scholars. Blood discharged a day or two before childbirth necessitates refraining from fasting and prayer, because it is either birth blood or menstrual blood.