If you are 39 weeks pregnant and have not reached your due date, it is usually normal for the fetus not to start, so don’t worry too much, as long as you pay attention to your pregnancy checkups and monitor the fetal movements daily. There are many reasons why the fetus has not started at 39 weeks of pregnancy, which need to be analyzed according to the specific situation. If the fetus is relatively large and has not yet entered the pelvis, the cervix will not be able to produce stimulation, and the labor will be delayed; it may also be due to the low level of estrogen, it is not easy to start the labor signals, which will not be able to produce the normal contractions, and the labor will also be delayed. Generally speaking, the difference between the expected date of labor and the actual time of delivery according to the last menstrual period is no more than 2 weeks, which is considered normal delivery. Pregnant women need to pay attention to whether the fetal movement, amniotic fluid volume, and placenta are normal, and follow the doctor’s instructions to choose a reasonable mode of delivery when the labor is approaching. It is recommended to have a reasonable diet in the late pregnancy, and exercise appropriately to promote the fetus to enter the basin, which is conducive to labor. If a pregnant woman has not yet given birth after 41 weeks, she needs to go to the hospital for examination and induce labor according to the doctor’s advice, so as to avoid the emergence of intrauterine distress and other adverse consequences.