It is not unusual to develop a viral illness that causes a fever during pregnancy or after your delivery. Mild fevers that last only a short time usually are not a concern.
An ongoing fever that does not get better with home treatment, such as taking acetaminophen, or that does not improve after several days may mean that you have a more serious problem, such as a bacterial infection. Talk to your doctor if:
Remember, fever is only a symptom. Often the importance of a fever can only be seen when other symptoms are present.
WebMD Medical Reference from Healthwise