help

Im nearing the end of my grow, and im a bit of an amateur compared to most and have a problem. me and the guy im growing with are having a debate when we turned them, i think there 8 weeks into flower and he says 6 and a half, they are 5 blue stella and 5 g13 haze, the stella has stayed real short and bushy and the haze have grown alot taller, the hairs on the stellas are starting to go brown and the g13 are still white, i started my flush period today but im worried bout when to crop and that i may have started to flush to early if my friend is right, is there any way to tell how far through the flower cycle i actually am? They look very healthy and have produced alot of bud, the g13 are now very sticky and covered in crystals but the stella has no crystals and is not as smelly. what do i do?

scope your trichomes....the only way to harvest your crop were you want them to be