Great news on the scans 
beano I'm also starting to feel like I'm squishing the baby when I bend down to the floor. My bump isn't even that big yet, so goodness knows what it'll be like one I have a huge bump!
Someone was asking a few days ago (sorry, I can't find who now) about whether it's that bad to lie on your back. I've read lots that it's best not to lie on your back for long periods after about 16 weeks because the weight of the baby and placenta presses on a major vein, so it can make you feel sick and dizzy and affect blood flow and nutrients to the placenta. I read a study which said that the best outcomes for the baby were with women who slept on the left side, followed by sleeping on their right side, then sleeping on your back the worst (though the info was from women reporting after pregnancy, so may not be that accurate). But everything I've read also says that you shouldn't stress if you start on your side then wake up on your back- you should just move yourself back onto your side, and try and avoid sleeping on your back as best you can.