Are Hot Tubs and Saunas Safe?
The March of Dimes recommends that pregnant women and women attempting to conceive avoid hot tubs and saunas. A number of studies have suggested that a body temperature of 102 degrees or higher during the first four weeks after conception increases the risk of neural tube defects, problems with closure of the baby's spinal cord or skull.
Besides steering clear of hot tubs and saunas, avoid exercising strenuously on hot days. And contact your health-care provider if you develop a fever over 100 degrees.