Fever is a symptom, not a diagnosis, and the most common cause is a viral cold or bacterial upper respiratory tract infection. Fever is common during pregnancy, and there are still tangles in dealing with it. If you don’t use medication, you worry that the high temperature will affect the fetus, and if you do, you worry that the medication will have an adverse effect on the fetus. In fact, the general fever does not need to be worried and does not need to be treated, but once the temperature exceeds 38 degrees, it needs to be taken seriously, and once the temperature exceeds 39 degrees, it needs to be treated. The literature suggests that a body temperature above 39 degrees for more than 48 hours during early pregnancy can cause an increased incidence of birth defects. For bacterial upper respiratory tract infections, some physical cooling methods can be tried on top of antibiotics. If they do not work in the short term and the temperature remains at 39 degrees or above, it is still recommended to apply antipyretic and analgesic drugs (most commonly acetaminophen paracetamol) for a short period of time, which will not have adverse effects on the fetus. If you do not use antipyretic drugs and your body temperature continues to exceed 39 degrees, it may have adverse effects on the fetus. If the fever is caused by a viral cold, taking antibiotics is ineffective, and the main thing is to use some auxiliary methods to lower the temperature.