I've read the left side supported by a body pillow. I've always been a back sleeper & at 17w4d i still continue to sleep on my back just elevated. I know its known to be a no-no but my Dr said its safe as long as I'm elevated & comfortable. Hope that helps!
Left side is best once you start getting bigger. You can sleep on ur tummy until your unable to from ur growing belly. I cant sleep just on my left side my legs get severe cramps so i rotate allllll night.
I think on your left side is the best position for circulation to the baby.
Many doctors say to sleep on your left side b/c circulation is better. However I can never fall asleep on my left so i usually end up falling asleep on my right side. And it DOES get uncomfortable, my shoulders and legs start to cramp and hurt :/