I have seen many women wearing those belts in their late pregnancy and they look so helpful for back support. I hope when I conceive, I can use one too because I already have mild lower back issues.
My mother said we shouldn't tie anything around the stomach, but my doctor suggested a mild support belt in my eighth month for my back pain. It was very helpful, so please ask your doctor if your body needs it before buying.
Currently in my 35th week and honestly, this belt is the only thing keeping my heavy tummy from falling off! I started using it in my 7th month because walking felt like a marathon. It's a lifesaver, especially when you feel like a giant penguin.
My pregnancy tracker app recommended starting a support belt around week 24 when my bump started growing rapidly. It really helped take the pressure off my lower back and made walking much easier, so you can check with your doc and try it.