HI,
With my DS i had low lying placenta. It did move up and i had a natural birth. With this pregnancy i also have a LLP, it is supposed to be 3cms off your cervix, mine is only 2.5cms so yipee i get to have another peek at bubs soon! Although they did say that it will probably move up as its only .5 of a cm off i still get that u/s!
Hope that helps...