ITS outdoor in my balcony ..so light is all frm nature..n yeah i got a lil thrips on my plant wen it was in veg...but its all fine now..got rid of them!
well not too bad then considering it prob. doesn't get the best light all day. at least your nodes are nice and tight. esp. for a sativa dominant plant.
Pure sativa's can flower up to 28 weeks (an equatorial zone breed) or as little as 10-12 weeks......most at around 14-16 weeks (that I've run).
So yes, your budding at 4 weeks looks on par for a 16 week breed.