Please help!

I'm planning a home birth and would like to have an inflatable pool
for pain relief purposes, there are two options, they are both at the
smaller end of the birth-pool spectrum.. here are the weights of the
pools (filled):

'la bassine' 450kg / 1000 lbs
'birth-pool-in-a-box' 480kg / 1056 lbs

My weight would be additional, I'm small.. but heavily pregnant (still
5 weeks to go) so estimate max 70kg / 155 lbs. The midwife and my
husband may obviously be attending to me close to the pool (but not in
it!) at times so maybe their weights should be taken into account too?

Can anyone advise on whether it's ok to put this in our upstairs main
bedroom? Our house is new (built 2006).
There is a supporting (or is it load-bearing? wall downstairs that
runs accross the bedroom (it's a very big room), would it be a good
idea to place the pool over that? Or over a joist?

Reading around, it seems like the main risk is rotten joists / beans
which is not a problem here due to newness of the house.

Obviously I don't want to be worrying about it on the day and
definitely don't want to end up taking a shortcut down to the kitchen
or dining room.

Should I get the advice of an architect / engineer, would that be
pricey?

Thanks, jb.