Hi Girlygirl,
If I were you the only thing that would be worrying me at the moment is high blood pressure. Try and take it easy!!
Sore back, just one of those wonderful pregnancy things!! I have really different pain this time, but find walking very beneficial.
Most placentas move, so there is no point worrying about that at the moment, there is nothing you can do about it, I am sure it will move for you!! But if it doesn't and you need a c/s then don't be scared, because it will be the safer option for both the baby and you.