It is normal to bleed on the fourth day of a painless abortion. Because the uterus will contract after the painless abortion surgery, it will contract to the state when there is no pregnancy, due to the contraction of the uterine muscles, the blood inside the uterine cavity will enter into the uterine cavity, and flow out of the body through the vagina by following the open cervix, and such bleeding may be clean only in a week. However, such bleeding is relatively small and will not exceed the amount of menstruation. If it is not clean for more than a week or if the bleeding is heavier than the amount of menstruation, it is not normal. In this case, it is best to go to the hospital for ultrasound to see if there is any residue in the uterine cavity or infection caused by the surgery, which leads to prolonged bleeding. Bleeding for four days after abortion is normal.