The first time you have menstruation after abortion, the blood volume is relatively small, it is possible that the endometrium has not fully recovered to normal, because the endometrium is traumatized to a certain extent after the operation and needs to be repaired gradually to reach a certain thickness, the endometrium is shed to bring blood down, which is the menstrual blood. If the endometrium does not grow to a certain thickness, the bleeding is relatively small when it is shed, and the menstrual flow will become less. You can observe for 3 months, and with the repair of the endometrium, the menstrual flow will gradually increase and return to normal. However, it is also necessary to go to the hospital for ultrasound to check the condition of the uterus. If there are adhesions in the uterine cavity, it will also lead to the situation of reduced menstrual flow. If the examination reveals that adhesions are identified, hysteroscopic surgery is also needed to peel off the adhesion surface in order to restore the normal menstrual flow.