How far is the placenta from the cervix?

Placenta from the cervical orifice greater than 7cm is normal, is the safest state, pregnant women according to the doctor's instructions to do a regular check-up can be. once less than 2 cm belongs to the low placenta, which is quite dangerous, easy to show painless vaginal bleeding in the third trimester of pregnancy, easy to show placental abruption before delivery, less than 7cm and greater than 2 cm, belongs to the low placental state, indicating that this distance placenta has been critical danger point, but also needs to cause enough attention. Therefore, in the third trimester of pregnancy, once the placenta is found to be less than 7cm away from the cervical orifice, it should be bed rest as much as possible and less active. If painless vaginal bleeding has been shown, it is necessary to go to the hospital for examination in time.