I know it's frustrating but just remember it's not a gain! Also have you seen the pictures that some people have put of what a pound of fat looks like - google it and then say your not happy to have lost half of that. Keep trusting the plan, you will get there.
Stick with it! I lost a pound then a pound and a half then a pound then all of a sudden 3.5 pounds in my fourth week. That's the equivalent of my first 3 weeks combined. It may not work the same way for everyone but it does work. Stick with it!
I didn't lose anything my second week. It's perfectly normal and you will need to get your head around these weeks where you have a tiny loss or can gain or STS for no apparent reason. I know it's frustrating but it doesn't mean it isn't working. Trust in the plan, it works.