No it means your piss has been tampered with to mask things..... such as DOPE!
I'm just fucking with you. Fact is, you should read the directions first before you drink $30+. Also, depending on what you are/were using and how often you use it will be the dependant factor. Research has shown in THC user (read: Potheads) whom are avid users metabolize THC, process, and dissipate canabanoids(spl?) faster than non THC users. So for a heavy use smoker, to go a week without could actually result in a clean system. Where as if you hadn't used it before it would stick in your system longer. I'm no scientist, I have just watched several videos regarding the subject.
The best thing you can do at this point is keep flushing (IE water) and before your test take something to bring the color back up in your pee. This may help you get around a flagged false due to color, however there are tests to see if your piss is diluted.
what kind of job is this for? If this is a "we watch you piss" kinda thing, you are fucked, however you can always tape some piss to your leg, nuts, whatever and just poor that in the cup, then you actually piss in the toilet they flush. Overall, not doing drugs would be the best approach, but that should give you some ideas. best of luck to you.