Drug test in a little over 2 weeks... should I be concerned?

So I am unsure what type of test i will be taking, so I want to be ready for the hair.
Do the hair detox ones work for this? Can I count on it working?
How and when should I get it and start whatever I need to do.
I have been chugging water since I found out today. Bad news though, I smoked yesterday, the day before, and weekend. Also, I have been a regular smoker (usually smoke at least once a day, sometimes more, sometimes not at all).
I have read that color pigment in hair holds more thc. Luckily, I have blonde hair!

Just looking for recommendations because I really want this internship. Right location, good pay, and paid holidays :), while still letting me take off when I want.
I just don't know where to start...

All answers are Greatlyyy appreciated!!!

I think I'm going to try the Mac route.
It still works correct? and any specific times I should be using? If I do it each time for a longer amount of time, will it help get more thc out or just be a waste and kill my hair haha