My SIL had the same thing and was told she would need a caesarian but she had a final scan at about 37 weeks and was told the placenta was just clear enough of the cervix to have a vaginal birth. It had actually moved from partially covering the cervix to not covering it at all. Her labour and birth went fine and there were no dramas. Like Kelly said don't worry too much about it until you have another scan further down the track.

Bon