Massage gun safety?

Sorry if it’s a dumb question, I’m just a paranoid mom wanting to see what others think and don’t want to bother my ob so late for something like this. So I was gifted a massage gun and want to use it on my legs and upper (maybe mid if it’s okay) back, is that alright? I know I obviously shouldn’t use it on my stomach, should I avoid my lower back, mid back, and thighs too? I’m 25 weeks if that makes a difference