Conclusion
It is important to keep any setting on the massage chair on low to avoid any issue. A massage chair is not usually an issue except your have a high-risk or complicated pregnancy.
References;
[1] https://www.medicinenet.com/nausea/symptoms.htm
[2] https://www.healthline.com/health/vomiting#:~:text=What%20is%20vomiting%3F,caused%20by%20underlying%20medical%20conditions.
[3] https://www.versusarthritis.org/about-arthritis/conditions/back-pain/
[4] https://www.whattoexpect.com/pregnancy/prenatal-yoga/
[5]https://indianexpress.com/article/lifestyle/fitness/everything-you-need-to-know-about-glutes-and-workouts-to-strengthen-it-6500613/#:~:text=Glutes%20are%20the%20strongest%20and,medius%20and%20the%20gluteus%20minimus.&text=lower%20back%20stress.-,If%20you%20want%20an%20enviable%20posture%2C%20make%20sure%20you%20train,2%2D3%20times%20a%20week.
[6] https://www.drugs.com/ibuprofen.html