After miscarriage, it takes about one month to have menstruation. After miscarriage, the endometrium is damaged and it takes about one month to repair before it can shed on its own, bring blood down and have menstruation. If irregular vaginal bleeding occurs within one month after miscarriage, it is not menstruation. It is considered to be caused by poor contraction of the uterus, so you need to take oral motherwort granules or biochemical granules to help the uterus contract and help stop the bleeding, and the bleeding symptoms should gradually ease and disappear after a week or so of oral medication. If there is no significant improvement after medication, the possibility of residual tissue in the uterine cavity causing vaginal bleeding cannot be ruled out. If it is determined that there is residual tissue in the uterine cavity, a cervical cleansing operation is needed to remove the tissue before the uterus can return to normal. Some people also have menstruation one and a half months or even two months after abortion, so after a medical abortion, the condition of the uterus can be checked regularly to facilitate the evaluation.