It is not normal to have a period 13 days after an abortion. Normal menstruation will resume around 28-30 days after the abortion procedure. Because even after abortion, it takes a certain amount of estrogen and progesterone to return to normal before the normal cycle can be resumed. However, 13 days after abortion is abnormal bleeding rather than menstruation. It is recommended to go to the hospital for an ultrasound examination in the gynecology department to determine whether there is residual blood in the uterine cavity and whether there is any contraction of the uterus, as these factors can cause abnormal bleeding. If necessary, we should check the HCG to see if it has returned to normal. Depending on the situation, oral medications can be taken to activate blood circulation and remove blood stasis, including hemostatic medications to regulate the cycle. If necessary, you should take artificial cycle regulating drugs, such as short-acting contraceptive pills, which can help normalize menstruation while repairing the endometrium, so as to avoid irregular menstruation in the future.