I was wondering that too a week or so back until I read that as long as keytones present it is probably better to be pale pink area as apparently darker pink can indicate your dehydrated! This does kind of run true for me as when I test when I've not had my full quota of water it's always darker pink & normally the same first thing in the morning. As long as keytones are present I'd not worry personally. Mine fluctuates between window 2,3 & 4 and I've lost 5 lbs both weeks I've been weighed so far. Best of luck with things :0)