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people will tell you not to lay flat on your back but i havent found anything wrong with it, i just propped myself a little bit. But from what i've learned laying on your left side is the best cause they get the most oxygen!
You should lay however is comfortable, right now. I had to stop laying on my back around 15 weeks because it became hard to breathe. At 19 weeks I can only lay on my left or right side, it feels like I'm laying on a canteloupe if I'm on my stomach and can't breathe if I'm on my back. :)