Are you weighing yourself every day (and no, I'm not saying you should, just asking!)?
You'll have lost 2-3 pounds already most likely but we're all different and to some extent it depends on how much you have to lose overall. The first week usually results in the biggest loss - most of us drop around a pound a day over that time. It slows down quite a bit after the first week though (to an average of half a pound a day). Just to be clear, it's not the fact that you're in ketosis that the weight drops off fast, it's the fact that you're eating hardly any calories. Being in ketosis just makes eating fewer calories more bearable (cos it takes the edge off hunger).
Hang in there!