Pregnancy is definitely a time for pampering, but you need to be careful. Avoid saunas, which can make you overheated. Ditto for hot tubs: According to the American Pregnancy Association, it takes only 10 to 20 minutes of sitting in one for your body temperature to reach 102 degrees Farenheit — nearly the limit of what’s considered safe for pregnant women. Also, certain essential oils can cause uterine contractions, especially during the first and second trimester, so check with your massage therapist to make sure only safe ones are being used. On the taboo list: juniper, rosemary, and clary sage.