Loads of people can't get the stick to turn pink on vlcds, so please don't worry about it - it doesn't mean you're not in ketosis! Remember, vlcds only bring on mild ketosis, so the ketones often get diluted enough to not show pink - some people also find they only show pink at particular times of the day.
The real test of ketosis is a supressed appetite - if you're not physically hungry in general, then you're in ketosis. The yukky breath is a 'positive' sign too!
This was what a CD consultanat wrote, thought it may help