Bro i did the same on my first grow. I was expecting 7 weeks flowering for my sativa bag seed so i flushed two weeks before i though it would be done but then the growth slowed so much and i didnt end up chopping till the 9th week of flowering. I dont think it mattered to much still had fat colas just like yours.
Awesome buds - inspirational
Now I wish my little plant would hurry up. Just when I think she's nearing harvest, she spurts out with a new generation of pistils. Patience, patience ...