my doctor told me laying on my back was okay until 20 weeks, and then I should be propped more upright. Not that I can't lay down at all on my back, but I should be at an angle to not let my baby lay on the nerves/blood vessels in my back. If you're unsure, you can always ask your doctor. I hope that helps a bit.

That’s how my doctor described it too me too. As long as you’re propped up it’s ok but don’t lay flat like you would if you’re on the floor. I typically use 2 pillows and she said that’s totally fine