It's always safer if the pregnant woman consults the doctor or medical practitioner before using a massage chair. Although massage chairs are considered safe for pregnant women, they can take a toll if she is suffering from any medical issues. Or a history of miscarriage or if it is a high-risk pregnancy. So, if the doctor you consult takes your case history and says that you can use it. Then ensure you don't use it for more than 10 to 15 minutes. It is of utmost importance to avoid heat function (heat pads) and Shiatsu massage during pregnancy. Since the risk of miscarriage is higher during the 1st trimester of the pregnancy, never use the massage chair during the 1st trimester.