The gestational sac should be at least 2 cm above the uterine incision to be relatively safe. Because with the increase of pregnancy week, the gestational sac will gradually increase in size, if the gestational sac is too close to the uterine incision, it may lead to the rupture of the incision, which will result in intra-abdominal hemorrhage and affect the life of the pregnant woman and the fetus. If it is too close, the placenta may cover the uterine incision when it reaches a certain level of development, which may lead to placental implantation, which may cause contraction and weakness of the uterus during labor, resulting in hemorrhage. Therefore, the scarred uterus needs special attention, regular ultrasound examinations, and attention to any abdominal pain, vaginal bleeding and other discomfort. The scarred uterus itself is prone to rupture due to the contracture of the scar, so special attention is needed for another pregnancy.