I happen to have a strong opinion on this!! I say get the band first for sure! I got my band approx. 16 months ago in anticipation of having a baby. No way was I going to go into a pregnancy at 235lbs!! So I got the band, lost 52 lbs and now I'm 8 wks pregnant and happy that I have this great tool to keep me from gaining so much weight that I know I would have gained otherwise!
From my personal opinion, I think you should be willing to wait at least a year before getting pregnant, though I don't think it's required.
Congrats on both the future band and future baby!!