Low placenta before 28 weeks of pregnancy is called placenta previa state. A 16-week pregnant woman with placenta previa who has a dropping sensation when walking may be having a preeclampsia. If a pregnant woman at 16 weeks of pregnancy has a falling sensation in her abdomen when walking, and if this is accompanied by lower abdominal pain or vaginal bleeding, this suggests that it may be a sign of preeclampsia. Placenta previa status at 16 weeks of pregnancy, with the increase of pregnancy weeks, the position of the placenta will be possible to move up, and may even grow to the normal position. However, pregnant women should be careful not to exercise strenuously, avoid squatting, and eat a balanced diet. Pregnant women in the 16th week of pregnancy who have a state of placenta previa need to go to the hospital for regular ultrasound examinations. If symptoms such as lower abdominal swelling and vaginal bleeding occur during walking, you need to go to the hospital in time.