12+1 pressure when lying down

LeAnne

So I've read that you shouldnt lie on your back when youre 20+ weeks because of the pressure possibly blocking blood flow, but I feel really weird lying on my back right now. It feels like theres a softball pushing on my belly and even though it doesn't hurt, it feels pretty odd. Anyone else feeling that at this stage? I'm not worried or anything I'm just wondering if any of you are feeling this strange feeling too lol.