I lay on my back because it is more comfortable. I am 35 weeks. I just kind of elevate myself with a few pillows.
Same here! 36weeks & it is a habit I can't control. I haven't had any problems from doing so, I wouldn't think it's a problem.
As long as you elevate yourself. I'm at the same stage and my ribs ache so bad I just can't get comfortable unless I sleep on my back.