A second pregnancy with a scarred uterus 1.7mm at its thinnest point carries some risk of rupture, but not necessarily rupture. If you have had a previous cesarean section, then another pregnancy is something to be cautious about as it will depend on how well the scar in the uterus has recovered. If the thinnest part of the scarred uterus is only 1.7mm, then during pregnancy, if the fetus is mature by the full term of pregnancy, a detailed examination can be perfected and a cesarean section can be carried out in time to avoid the subsequent risks. If the fetus is still too small or even unable to promote lung maturity, then close observation is needed to monitor the growth and development of the fetus as well as the uterus, and in case of other abnormal symptoms such as abdominal pain, it is recommended to seek medical attention in time to prevent life-threatening situations. Throughout the pregnancy, pregnant women should relax and not put too much pressure on themselves. If there are any abnormalities, it is recommended that they seek medical attention in a timely manner and deal with them positively, so as to avoid affecting their lives and health.