Hi Slinkstah
With the placenta, I think it just depends on you, the midwife and how the birth has gone. Mine was completely uncomplicated and it was actually my midwife who suggested I deliver the placenta naturally, rather than having the injection. My legs were a bit wobbly when I had to squat to deliver the placenta, but I just lent on the sides of the pool. I don't remember there being any blood, but then I was completely out of it on gas, air and euphoria! I'm sure there was some blood, because I tore quite badly, but you certainly can't see any in the photos which were taken within seconds of her birth - perhaps it sinks to the bottom??????
No idea about the membrane rupture thing. Mears is probably the person to ask.
I'm tall and big, so I sort of bobbed in the pool rather than floated, but I was on my back, with my head above water at one end, and my feet pressed against the other. It was sooooooooo comfortable!
I took my own towels with me - hospital towels are small and crispy (if you see what I mean!). It was lovely to wrap myself and dd in a big soft towel for a few minutes before dh took her while she was weighed and I was stitched.
I also took my own music which was wonderful!