Yes, rest assured--this is normal. I think everyone of us went through this and really scratched our heads, LOL. During this time, though, the inches usually still drop. If you haven't taken your measurements, do so. They're just as important as your weight (maybe even more important).

Times to watch for water weight gain (probably your 3 pounds) are as follows:
Salty foods, not drinking enough water, TOM, PMS and/or ovulation.

I have to agree with Lisa--you've had an astounding success so far! Pretty soon, your body will catch up. Just hang in there.