The lower edge of the placenta at 17 weeks of pregnancy is 14mm from the cervical opening, which is a low placenta position with the possibility of bleeding. Normally, the lower edge of the placenta should be at least 30mm away from the cervical opening to be safe. If it is lower than 30mm, then the placenta is in a low position and it is easy for the placenta to detach from the uterine surface, thus causing bleeding. The lower edge of the placenta is 14mm away from the cervical opening, you must pay attention to appropriate bed rest to protect the fetus, which can prevent the occurrence of hemorrhage, but pay attention to not absolutely bedridden, to avoid the occurrence of thrombotic diseases during pregnancy. Meanwhile, at this stage, you can review the ultrasound regularly to know the change of the position of the placenta. The lower edge of the placenta is 14mm away from the cervical opening, and it is noted that it is not possible to have coitus, do not lift heavy objects, etc. to avoid bleeding caused by placental surface detachment, because if there is bleeding, the risk of mother and child will be higher. If there is any abnormality, consult the doctor in time to avoid delay.