This all depends on the woman and if she has been pregnant before. If a woman has been pregnant before later pregnancies can be harder and more painful. If this is the first pregnancy your muscles are still tighter so it might not be as bad. It basically feels like you have a bubble in your stomach and it is pressing on all your organs and making you uncomfortable. It is a feeling of fullness and pressure from the inside as well as many backaches and cramps in muscles everywhere in your body because it throws your whole center off.