Is it possible to hurt your baby by wearing a maternity band/belt too tight?

I'm 30 weeks pregnant and have had horrible back pain since about 20 weeks. I've gotten a maternity support belt and it seems to help somewhat. I've also gotten to where I wear it every day for atleast 8 hours. Is it possible I could wear it too tight? The only way it helps is if it's snug and I'm concerned that it could hurt the baby. I'm able to breathe fine with it on but the edges of the belt kind of cut into my fat but it's not painful. Maybe a little pressure. I'm probably just being crazy but what do you think?