probably 2-3, but maybe upwards of 6 or 7, what strain is it?. the pistils are mostly white and your calyxes haven't swollen yet. I don't buy into the whole trich test thing, it helps but its only tool i think, it doesn't give you the whole picture. wait until your buds look done, then chop chop. trust me you'll know, it wont be a question. You'll see the buds themselves start to change, not grow really, but the calyxes will start getting bigger, the hairs will recede into the bud and the whole plants will start to take on an almost golden sheen. your calyxes are thin and almost flat, when ready they will look almost like tiny green tears. not completely round, just fat. you should have have a 1-2 week window for optimal potency during this same time so done sweat it too much. if you're still unsure you can harvest a nug and quick dry it and check to see if your likey, just keep in mind a quick dried bud wont taste as good or be as potent as the real deal.