aye i wouldn't worry about the hairs, my last grow the hairs went brown after 5-6 weeks and i was thinking the same but check the trichs and wait for about 20% amber i think it is. also might be an idea to look up what the breeders say about how long to flower. it will give you an idea on how long you've got. dont be to hasty to chop as i did and got average smoke. i would say when you think it;s done wait another week. not going to do any harm.