Maybe she is finding the bed too hot? I think it's hot where you are, like it is here. Just be careful going down the stairs that you don't trip over her. Whatever the reason it doesn't sound like anything to worry about.
Some of my friends did baby preparation games with the dog, to accustom them to the idea that Mom would soon be carrying a precious package wrapped up in snuggle blankets. They got them from either their Doctor or their Vet. Are you trying some things like that? You can probably find such things on the internet these day. Just, I'm getting a bit of a worry vibe about the baby from you.
Maybe?