Yes, to the point that the woman herself does not realize she is pregnant until the end of her term. This can happen with a small fetus in a primiparous woman, a tall and large athletic woman with a trained abdominal wall, or an overweight woman with wide hips and severe obesity in the abdominal area. Sometimes women tighten their bellies with belts or corsets to deliberately hide their pregnancy, but already in the second trimester this becomes dangerous.