It is not certain how many days pregnancy vomiting can be relieved by infusion, some pregnant women will get better after infusion, a few pregnant women will continue to have pregnancy vomiting for the whole pregnancy, which cannot be relieved by infusion. Pregnancy sickness may be related to the level of human chorionic gonadotropin, most pregnant women after 12 weeks of pregnancy with the decline in hormone levels, pregnancy sickness symptoms can be improved. Pregnant women with severe symptoms such as vomiting often need fluids to prevent dehydration and electrolyte disorders, and may also be given metoclopramide to stop vomiting, but the effect is not the same, some patients improve after a few days of treatment, while some patients do not have a significant effect or even need to terminate the pregnancy. The probability of recurrence is also different, some patients relieved for a few days and then vomiting again, some pregnant women do not relieve at all. During pregnancy, pregnant women should pay attention to prenatal checkups, actively listen to the advice of professional doctors to do a comprehensive care and health care, pay attention to more rest, and should relax, avoid tension and anxiety. If the symptoms of pregnancy vomiting are serious, you need to consult a doctor in time, and follow the doctor’s instructions for treatment, to prevent ketoacidosis and other serious complications life-threatening.