There are many causes of chills in pregnant women, which are classified as physiological as well as pathological. In the early stage of pregnancy, pregnant mothers often experience early pregnancy reactions such as chilliness, drowsiness and lack of appetite around six weeks after menopause. This is due to the change of hormone level in the body after pregnancy, and the body temperature center has been regulated to a certain extent, so the chilliness at this time is a normal physiological phenomenon, and there is no need to be too nervous and worried, and most of them will gradually disappear around 12 weeks after menopause. There are also some cases that are pathological, such as chills caused by a cold, and the body temperature should be monitored at this time. If the temperature rises significantly, you should go to the hospital promptly and get the appropriate treatment. In addition, infectious diseases such as pneumonia and pyelonephritis can also cause fever, so we need to deal with the symptoms and the cause.