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You may start sweating earlier and faster, so be sure to hydrate well and wear loose-fitting clothing. It may be best to move indoors on hot or humid days, particularly in the first trimester when a high body temperature (above 102 degrees) may cause neural tube defects, although ACOG says it’s unlikely exercise will increase body temperature to a dangerous level. Hot yoga, hot tubs, and saunas should be avoided, however, because they can quickly raise your body temperature above 102 degrees.