Every pregnancy is unique and no two pregnancies can be compared its natural in the first trimester to vomit, pass gas and have lot of discomfort in the abdomen. Have fatigue and feel weak. This will subside in the second trimester until then lots of fluids should be given to your wife and good care should be taken. Hope you are consulting a good gynecologist and giving her the pre natal vitamins prescribed. Rest and emotional support is very important during this period.