I didn't with my first, but I did with my second. An HB friend sent me hers! And it was a relief to have it after an early CP loss. I stopped using it when I could feel regular movements, but it helped a lot in the first trimester with my nerves.
I'm not sure I'd recommend it for a first time mom though. (A friend was asking if she should get one.)
Did you use one? Was it helpful? Would you recommend for a FTM?