Thinking, I want you to realise that including myself, I know 4 people who have still had PP at the late scan (mine was at 34 weeks each time), I was the only one to have any admissions, the only one who had an emergency CS. Everyone else had a planned CS and went on to have a second normal pregnancy, although at least one had a second CS.
MAYHEW's advice about calling an ambulance follows the advice I was given, which was "if it is any more than one drop of blood, call an ambulance". I didn't ever call one, although in retrospect there were a couple of occasions when I really should have done. (In fact, the last time I was admitted, I had been banned from travelling to a family wedding, I was at home with DM and DD1, I felt the bleed, went and checked, saw it was already passed hospital dinner time, so finished cooking and ate my dinner).
A hysterectomy is always a potential complication from a CS, but when I queried this, I was told that this was a last resort and would only be done to save my life, so please try not to worry about this too much.
My experience has told me that some medical professionals are so jaded by dealing with medical problems on a daily basis that they become blasé about them and misjudge the impact the problems have on the families concerned. I'm sure they didn't mean to scare you, but when these things are thrown at you, you don't think of the questions you should ask, they come later.
Have you managed to arrange a consultant's appointment?
Fingers crossed, you will be like my friends and go straight through to a planned CS, if not, you have your bag ready. With DD1 I was in hospital for 3.5 weeks before having her.
Good luck.
Ps, follow the ambulance advice, not the cooking dinner example!