Under normal circumstances, the symptoms of nausea and vomiting should occur only after the gestational sac is implanted, but due to individual differences and sensitivity to the growth of estrogen, a slight nausea will occur after implantation when the secretion of human chorionic gonadotropin begins, which is a normal symptom. As the pregnancy cycle increases, not only nausea will occur, but also vomiting, anorexia, loss of appetite, drowsiness, or body aches and weakness are all normal symptoms. More hormone secretion in the body will also occur in pregnancy vomiting, need to pay attention to replenish fluids to avoid vomiting too serious lead to dehydration.