It takes about one month after a medical abortion for menstruation to occur. A medical abortion causes certain damage to the uterus and the endometrium and requires the uterus to gradually contract and return to its normal form. It takes about one month after the abortion for the uterus lining to gradually repair and return to normal before shedding, at which point menstruation will occur. If vaginal bleeding occurs within a month, it is not considered to be menstruation. It may be due to poor contraction of the uterus, or there may be residual tissue in the uterine cavity, which requires ultrasound examination at the hospital for a clear diagnosis. If the bleeding is caused by uterine contraction, you can take Yimoucao granules and Xinbiochemical granules orally to help the uterus contract and stop bleeding. If the examination shows that there is residual tissue in the uterus cavity, it is necessary to do a uterine evacuation operation to remove the residual tissue before the uterus can return to its normal shape and normal menstruation can be resumed. In some patients, the recovery of the uterus and the endometrium is relatively slow and it takes a month and a half, or even two months, before menstruation occurs.