ATKINS DIET INDUCTION PHASE: Why am I not losing weight though I am currently in Ketosis?

I am totally confused. I am eating less than 20 net carbs a day, and have been for about 9 days now. I bought Ketostix to make sure I'm in Ketosis. I am...as the strips turn purple. Yet...I'm not losing weight. I'm not gaining, but not losing. Anybody who's had experience with Atkins want to lend me some advice?