sativas can be a feckle thing. it could take another 6-7 weeks to finish maybe longer with some strains nd thats not accounting for pheno differences which could all take different lengths of time to finish.
I never grew a full on sativa, but I read that they have these growth spurts, like it may be ready, then it start to grow bigger buds and they're clear again, gotta catch the window and the right time.