Any mamas use a waist trainer? I am 5 months pp and am looking for back support more than anything…

Any mamas use a waist trainer? I am 5 months pp and am looking for back support more than anything else. I need something that will force me to stand up straight because I now have horrible posture. Not only is my back always sore but it looks like I'm 6 months pregnant because I lean back so much. Thanks!