Yeah, you still have plenty of growth to go if you're at week four. I dunno about most of it going on there the last two weeks, but I did have problems in the beginning of flower that stunted the growth somewhat so I still don't have a really good perspective. But I do know that a lot of the development (as far as bud form and maturity, trichs and what not) definitely happens at the end so make sure not to pull them early. Makes a huge difference