No blood on the third day of a painless abortion and then blood on the fourth day is usually normal, and there is usually a small amount of bleeding for a week after the procedure. After a woman has a painless abortion, the uterus will contract to an infertile state, and as the uterus continues to contract, the blood in the uterine cavity flows out of the body through the open cervical opening. It usually takes about a week to drain completely, and the amount of bleeding is usually small, no more than the amount of menstruation, so it may be normal to have no blood on the third day and then blood on the fourth day after the operation. If a woman still has vaginal bleeding after a week and the bleeding is heavy, it is recommended to consult a doctor in time, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and target treatment.