I have a lot of tension in my shoulders. Is a back massager safe to use on shoulders and/or lower back during pregnancy?

Pregnancy massage. A message during pregnancy is a great idea as long as one is gentle with you.
Yes enjoy. Heat, massage is all good. Enjoy it and you deserve it.
Yes enjoy. There's no scientific reason that woul Prohibit you from enjoying a massage. Consider a body pillow for slight tilt and support.