Nausea and Vomiting during pregnancy
Increased levels of hormones that sustain the pregnancy may cause morning sickness, which is feelings of nausea that can sometimes lead to vomiting. In addition to the increased levels of hCG and estrogen, the rapid stretching of the uterine muscles, the relaxation of muscles in the digestive tract, an increase in acid in the stomach and the enhanced sense of smell pregnant women develop can all contribute to morning sickness.
Just over half of all expectant women experience the nausea and vomiting associated with morning sickness. However, morning sickness does not necessarily occur just in the morning and rarely interferes with proper maternal and fetal nutrition. Even those women that actually lose weight during the first few months of pregnancy because they have a hard time keeping any food down are not hurting their baby, as long as they make up for the lost weight later on. Also, if you are experiencing morning sickness, the symptoms usually don't linger much beyond the third month.