Glucose tolerance is used to test if a pregnant woman has gestational diabetes, and is a test that is often done during pregnancy. It is normal for most pregnant women to have this reaction. Pregnant women can choose to drink the sugar water slowly, do not be too anxious. After drinking the sugar water, pregnant women should make sure not to vomit, because vomiting will affect the glucose tolerance test results, which will cause inaccurate results and require a new test. After the glucose tolerance test, try not to walk back and forth or exercise drastically, as it may affect the accuracy of the test results.