Sometimes there are "symptoms" of ketosis - metallic mouth, bad breath, I got a "fuzzy" feeling in my mouth, no matter how much I brushed my teeth my mouth felt gross. Eventually your body adjusts and the symptoms lessen or go away. Most importantly, you know you're in ketosis when you aren't hungry anymore!
Don't rely too much on the ketostix though - they are highly unreliable if you are drinking as much water as you should be (which will dilute any ketones in your urine), there should never be enough ketones in your urine to put the stick in the dark range of color.
REBOOT wk1: 7 lbs, -5"; wk2: 2.6lbs (no measuring tape!); wk3: 1.8lbs, -3.5"