Thanks so much for your replies - I would say you're probably right re: the sleeping on the back. If anything happened to bubs and I had slept him/her on the tummy I don't think I could live with myself.
I think having the shower after bubs is born is a great idea - however I think that mine will be quite big and I couldn't handle that when bubs is new. I suppose around 30 weeks will be it!!

Thanks again