Will a fever of 38 degrees Celsius in early pregnancy affect the fetus? The early stages of pregnancy are a very critical period. Any abnormality will cause pregnant women to worry, especially symptoms such as fever. So, will a fever of 38 degrees in early pregnancy have any impact on the fetus? This article will elaborate on multiple aspects such as fetal health, maternal health, drug treatment, and the impact of pathogens. 1. Fetal Health Will a fever in pregnant women bring risks to the fetus? Generally speaking, a short-term fever will not directly affect the fetus.