The gestational sac is a form that the embryo takes at the beginning. During the obstetric examination, pregnant women can see the position of the gestational sac through ultrasound. If the position of the gestational sac is on the low side, it may be caused by the low location of the fertilized egg, scarred pregnancy, placenta praevia, etc., which should be dealt with according to the specific situation. 1. Low location of the fertilized egg: the location of the fertilized egg is on the low side, so the position of the gestational sac is on the low side, which requires proper rest, reasonable adjustment of diet, keeping the stools smooth, prohibiting coitus, avoiding Miscarriage: the fertilized egg is in a low position, so the gestational sac is also in a low position. If miscarriage does not occur, around 16 weeks of pregnancy, the lower segment of the uterus is formed, and the position of the placenta will gradually extend in the direction of the uterine fundus, which can improve the situation of low gestational sac. If symptoms of miscarriage such as lower abdominal pain, lumbago and vaginal bleeding occur, it is necessary to go to the hospital in time; 2. Keloidal pregnancy: if there is a history of cesarean section and the position of the gestational sac is relatively low, there is a possibility of keloidal pregnancy, which is very likely to suffer from hemorrhage. Therefore, it is necessary to go to the hospital with conditions for treatment, which can be treated by surgery or medication; 3. Placenta praevia: If the position of the placenta is lower than the fetal prenatal part through ultrasound examination after the seventh month of pregnancy, attached to the lower part of the uterus, and the lower edge of the uterus reaches or covers the cervical os, it can be diagnosed as placenta praevia, which often leads to painless and massive hemorrhage in the late stage of pregnancy, and it should be taken seriously, and it is usually recommended to deliver by cesarean section. Cesarean delivery is usually recommended. In addition, if there are polyps in the uterine cavity or intrauterine devices, etc., it will affect the positioning of the fertilized egg, resulting in a downward shift of the location of the fertilized egg, which is the low position of the gestational sac in the late stage of pregnancy. If the gestational sac is in a low position, it is easy to have spontaneous abortion, so it is usually not possible to continue the pregnancy.