It is not necessary to fast after the miscarriage to review, the review mainly check the ultrasound, if not to do the ultrasound is necessary to hold urine. If the ultrasound is not done, it is necessary to hold urine to see if the uterine cavity is clean, if the uterus is recovering normally, if there are any residues in the uterine cavity and if there is no fluid in the uterine cavity. If the examination is normal, it means that the uterus has recovered well after the miscarriage. After the miscarriage, the first menstruation may be abnormal, some people may have excessive bleeding, and some may have too little bleeding, which are relatively common cases. This is because miscarriage can cause endocrine disorders, which usually return to normal after 2-3 months. If the menstrual flow is low after abortion and does not return to normal after 2-3 months, further ultrasound or hysteroscopy is needed, which may be caused by endometrial damage.