how to tell when the last two weeks of flowering is so I can do a two week flush

I'm just finishing up week 6 in flowering. Bag weed seed so I don't know when they are suppose to finish. I'm using an ebb and grow system and want to flush the last two weeks but I dont know when to start. any help would be helpful. Thanks

post a pic so we can see

I would but my camera doesn't have macro.

ok. does it look like a satvia or indica?

oh. is it a satvia or indica?