Bleeding on the fourth day of abortion is normal, after abortion its bleeding duration is 7-10 days, at this time after abortion on the fourth day there is still bleeding is normal. Generally speaking, the amount of bleeding after abortion is below the amount of ordinary menstruation, that is, significantly less than the amount of ordinary menstruation, a small amount of bleeding in dribs and drabs. At about 7 days after the abortion, no matter how little bleeding there is at this time, the corresponding ultrasound examination should be performed to find out whether there is any obvious residue in the uterine cavity, and according to the results of the ultrasound, if necessary, combined with the value of the blood HCG to consider whether to give a re-cleansing operation. If the bleeding increases significantly after the abortion, you should have a follow-up examination as soon as possible, no matter how many days after the abortion.