Agreed. Don't listen to bonghitwillie

Firstly never assume you are going to be clean or not. Buy a take at home drug test from your local drug store but wait until about a week before the real test. You'd more than likely fail now since it's only been a week or so since your last toke. Use your first pee of the day when you wake up. It will be the dirtiest then. If you fail you have two options, dilution or substitution. Both are super easy, with the later you can still smoke with impunity.

2nd, you cannot flush THC out of your system. It is NOT water soluble. Only time and exercise help. Flushes, detox pills, teas, drinks, pectin, niacin, are all BS.