GO SWEETPEA! That's wonderful and I'm really happy for you! As for whether it's fast or not -- it's pretty fast, but I think it kind of depends on how much you weigh and where you are in your journey. I know that I lost about that much my first month; I started at 284. Now of course, I don't hit anywhere NEAR those numbers.....but i'm still losing. So enjoy it! -- and make sure that you're losing in a healthy way, and don't get discouraged if it slows down.
In the meantime, WOO HOO!!!!