To tri or not to tri

So, I'm contemplating whether or not I should still do the triathlon I'm signed up for next month. It's an Olympic distance (1.5K swim, 40K bike, and 10K run) and it's down in D.C. Most of my teammates are registered and I know it would be fun to head out of town for a few days but I'm not sure if I'm ready. There is actually a sprint triathlon that same weekend, a little closer to home, that I may do instead. I just don't know...