After taking Zinc, D3, Biotin, my shedding has declined significantly and my hair is growing very fast. Does this mean regrowth?

I have extremely fine/thin hair all across my head and losing a moderate amount of hair in the shower. After taking Biotin, Vitamin D, and Zinc, my shedding has basically disappeared but its to the point where its at least 50% less. My barber was shocked how quick my hair has been growing - probably 3x as fast. I've yet to see any regrowth though, maybe my hair appears ever so slightly thicker but it has been about 6 weeks. When will I notice regrowth, if at all? Is this a good sign?