ODRISH - that still means you're down three pounds, that's great! It's highly unlikely that you actually lost five pounds of body fat in a week. Most of that was probably water retention that got flushed out of your system. And it's equally unlikely that you gained two pounds of real body fat since then. Your body is trying to come to an equilibrium with your new plan, and it's normal for your weight to fluctuate. Try not to let the scale get you down, but if it does you might want to consider weighing in less often.
Also - being under for calories one day will not necessarily mean a lower weight the next morning, just as being over one day does not mean you'll gain weight overnight, either. It's all about the long haul, so make sure you are getting enough to eat everyday or it could actually hinder your loss in the long run. Best of luck to you!
SW 5/7/12 - 230
6/7/12 - 223.1 (-6.9)
| Pounds lost: 0.9