Belly band

Bethany
When is a good time to buy belly band and what are some good ones to try??  I'm only 9wks and 3 days, but having back pain when I'm on my feet too much (I'm a server though, so that isn't going to ease up!).... Is it too early to buy one?  I know I don't have a "belly bump" yet, and what I have was there before or is bloat.  But this back pain is bad!!!