Does laser hair removal with Candela Yag GentlePro work with fair skin and medium brown hair?

I have had 4 sessions, spaced 4 wks apart, and have not noticed a difference yet. I tolerate pain well, so the laser has never been turned down low. Am I wasting my time? I bought a package of 12 sessions, but don't want to keep going if it will not eventually work. On a scale of 1-10, 1 being the lightest- my skin is probably a 2 if that.