Oh, pshaw! That's totally just a fluctuation. I tend to weigh myself daily, and you should SEE the ups and downs based on various factors.
If there was a lot of sodium in that (and let's face it, if it was that many calories, we don't know WHAT was in it) then you're probably facing some water retention. If it's your TOM too.. well, damn. Yay for bloating and a higher scale number. The exciting thing is that if you stick to your diet and exercise, it's the most fun thing in the world to have all that water weight drop off overnight and go from being up 3 lbs to down 5!
*HUG* NO WORRIES!!!