Any loss is great and nothing to be upset about! If you're gaining now, it could be close to your TOM or ovulation. I know I gain around both of those times. Also, it's impossible to gain 3 pounds in 30 minutes unless you ate something. It sounds like there could be something very wrong with your scale and I'd highly suggest picking up a new one.

Also, if you've been on this WOE before, I've heard that the next time around.. or after several times, your body doesn't respond to it as quickly. What I suggest is adding more exercise. That will make all of the difference. Also, there is a supplement you can buy called L-Carnitine which is known for helping your body metabolize fat quicker. It works for a lot of people and you may want to give it a try.