After 3days of abortion, bleeding occurs which lasts for one week and stops, but bleeding started again when i resume exercise, when it will last?

Variable: This bleeding can last up until your next normal menses which should occur about 4-5 weeks after the abortion. If the prolonged bleeding becomes heavy or extends for over four weeks it could indicate that there is still some pregnancy tissue left in the uterus. This is best determined by ultrasound scan. If you bleed past 4 weeks or if the bleeding is heavy you must be checked.