Thats funny cause im in the same boat. ..i have a og kush plant at 7 1/2 weeks...and its pre-flowering like crazy ....i toped it twice so its growing. 6 tops. And many tops around the base. I. Toped too...hoping at least 5-8ounces.
There are a couple fan leaves tht are slightly yellow....its been this way after 5 days of givin it a shot of nitrogen. ...i cant figute out this issue ..need help!!