Trichomes are just one factor when determining if a plant is ready and not as reliable as many seem to think. Some strains don't amber while others amber early. Just from the look of the plant it's not ready. I don't even look at trichomes anymore. I wait for the plant to stop putting out new pistils and after the buds swell and the pistils shrink into the calyx's I wait a week - ten days. Then chop. Although some sativa's never seem to stop making new pistils so you have to take that into account if growing one. But you have a few weeks left.