Why Vomiting When Pregnant. When women are pregnant, food goes through the gastrointestinal. Extreme nausea and vomiting during pregnancy might indicate a multiple pregnancy (you’re carrying more than one baby) or hydatidiform mole (abnormal tissue growth that is not a true pregnancy). Why Do I Experience Nausea and Vomiting During My Pregnancy? from www.doc2us.com Nausea …