Yes, this is completely normal for some strains, consider yourself lucky.
San Fernando Lemon Kush from Sweet Seeds is another strain that will get trichomes very, very early in flower.
Usually start seeing frost on top notch genetics 2.5 weeks into flower to 3.5 weeks in.
Looks nice, little concerned about how thin those sugar leaves are but could be genetics.. good work
It's a nice strain , excellent trim for make hash. I have one strain of mine like yours ,thricomes are around fan leaves also,name is double cookies from BSF