Belly support bands for exercising..

tedro2ac

I was at the gym yesterday and a woman, who had to be at least 7 months pregnant, was working with this band around her belly. Im guessing holding in place while she was running and lifting weights. I was working out a ton before getting pregnant and I want to continue with it as long as I can. Has anyone ever used one before? If so, can you recommend a brand or where to purchase?