I was on Atkins Induction for 5 weeks, and no loss of fat. How can this be?

I think I was in ketosis, due to body odor changes, but apparently I was burning either the fat or protein I was eating. I know you have to eat plenty of fat, and I think I ate enough, as the Atkins book does not instruct you to go overboard with fat consumption, but I ate quite a bit of fat. Any ideas?