Lift a lot of weight. Stress out... it varies for all women.
Early in pregnancy you can do pretty much everything you are used to although it is not a good idea to take up a strenuous activity you have not done before. As pregnancy progresses the bump gets in the way of a lot of things and many things you are not allowed to do, like carnival rides.
Smoking cigarettes.
Drinking alcohol.
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taking a hot bath, being in a hot tub or using a heating pad, eating raw or undercooked meats, eating fish that contain mercury, jumping on a trampoline or any other exercise that causes a lot of sudden jarring movements (walking is recommended but not jogging), taking any pain medicine without consulting your doctor first (acetaminophen is the only one i know of that you can take safely) NOT even Tylenol.