She probably just wants food. Don't stand between her and food. ..Just try to help her out, coz I'm assuming you don't know how hard it might be to go through pregnancy. Sure she doesn't mean to be a bitch, because who does?
*holds back from naming names*
Never hit your mother, not only is she your mother, she is also a woman. And quite often a young teenage boy can be more stronger than her. Just keep it cool and stick it out until the pregnancy is over. Patience pays off.
patients is indeed a virtue... shes gonna be all over the place with emotions. dont worry, it will get worse but dont forget that it will get worse before it gets better. whatever you do, dont ever make her feel like she is alone. that is the worse feeling a pregnant woman can feel, or so ive been told.