Postpartum lochia is usually discharged within three weeks. Your condition is called lochia, which is thought to be caused by poor involution of uterus. Your blood HCG has returned to non-pregnancy level, so choriocarcinoma can be ruled out. B-ultrasound shows that the endometrium is not thick, so curettage is not needed for the time being. It is suggested that oxytocin should be injected to strengthen the hemostasis treatment of uterine contraction, and Chanfukang granules can also be taken to help the uterus recover. Nanning Zhongshan Hospital wishes you good health. If in doubt, please consult.