If you are saying that most of the pistils are a red colour (say about 70% roughly) i would say now would be a good time to do it. Its obv really your call and ob there is alot of mixed opinions but definately dont flower more than the 8 week mark.
If you wanted to try it out and see for yourself just snip a little bud off put it in an envelope or make one and pop it ontop of the radiator or a lampshade with the lamp on (turn it over every now and then) when its dry enough (u should check ever 5 to 10 mins so it doesnt get too hot) try it out if you get a pretty good high from it then chop it if you are not happy dont.
Defo not ever the 8 weeks mark though good looking girl though mate!
never use heat to dry bud. you took all this time to grow it why fuck it up drying it. dry even a lil bit in a cool dark well ventilated area....NO HEAT