Placenta praevia is a placenta that is positioned low enough in the womb to be a potential problem for delivery. Usually through complete chance, the placenta may have developed covering the cervix, or very close to it. With a ''central'' or ''complete'' praevia, there is no way you can have a normal delivery as the placenta would start to bleed very severely as your cervix started opening. In this case, a Caesarean Section is mandatory.