Does the position of the placenta determine the type of delivery?

Question
I am 21 weeks pregnant. My scan showed the placenta posterior wall is just touching the OS, Grade. Scan in the 13th week says that the placenta was covering the internal OS. Will I be able to have a normal delivery? Is the position of placenta a problem?
Expert Answer
A
No, the position of the placenta is not a problem it may migrate safely upwards and there is a chance that if it does so you will have a normal delivery.