What are some safety precautions I can take while pregnant and visiting a spa?

Avoid high heat. Pregnant women should avoid high (over 100 degrees) heat, thus no saunas, or jacuzi's are recommended. Additionally, preclean any equipment you use with an alcohol wipe or hydrogen peroxide before touching them. Do not soak any fingers or toes in chemicals, and certainly don't if the bowls have not been thoroughly cleaned before you use them.
Inform of pregnancy. When having a spa treatment it is important to inform the therapist about the pregnancy. They may avoid certain treatments such as use of some acupressure points or heat. Use of a hot tub or hot steam is not recommended. Cool mist and gentle massage are considered safe. Consult your md before the visit as a spa treatment may be contraindicated with certain medical conditions.