THE REASON THEY TELL YOU NOT TO IS BECAUSE IT CAN INCREASE NAUSEA. But I haven't had any issues with it, resting as much as I can during pregnancy has helped me.
Ya don't see why not. I'm 22 weeks and lay down after eating sometimes. The only thing you might get is heartburn.
Its not good in general pregnant or not to lay down right after you eat.! I still don it and Always have but yea they do say its not good