first off, nice job for your first time. looks better than my first grow.

Anytime your fan leaves begin to yellow like that you run the risk of mold starting at the exact point where the leaf connects to the plant.
If you can tug on the fan leaf and it comes off thats not really a good thing. its going to happen throughout the later weeks of flowering, but be sure to do the tug test on yellow leaves.
I personally would chop it. 10 weeks is plenty. plus with leaves that yellow and buds that big you dont want to fight mold. AK-47 is my favorite strain and I have grown it many times so this advice is from direct experience and not based on hunches.

Hope this helps...