The main symptoms of placenta previa

The main symptom of placenta previa is painless vaginal bleeding, which is the third trimester of pregnancy. It is normal to think that the diagnosis of placenta previa is based on the examination before the last termination of pregnancy, one is ultrasound, one is gynecological examination, in addition to postpartum to see the distance from the placenta to the placenta margin to make diagnosis, placenta previa bleeding is the main symptom of third trimester bleeding.