Are my buds further along than i tought?

You still have 3-4 weeks, so don't start flushing too soon, your plant still needs good nutrition to finish growing her flowers. Wait until there are about 90% brown pistils, flush for a few days and harvest when there are 95% brown pistils. This will give you flowers with prime cannabinoids with peak THC, fully developed terpenes and moderate CBD and CBN levels. Waiting until all the pistils are brown will result in flowers with degraded THC levels and with elevated CBD and CBN levels, producing a heavy and sleepy body type stone. Harvesting at 95% brown pistils will give you a more clear, brain tripping head high with more psychoactivity and less drowsy effect. Depending on which type of effect you prefer, will guide your harvest timing. Pistil colour will more precisely reflect flower health and it is flower health which determines cannabinoid composition. Judging harvest maturity based on trichome colour alone is not a reliable indicator in my opinion. Some strains will never have amber trichomes whereas some strains will have 75% amber trichomes after only 4 weeks of flowering. Harvesting at either of these extreme examples would produce flowers that are nearly dead or flowers that are immensely under developed, and both will be disappointing. This is why I base my harvest timing on pistil colour and not solely on trichome colour. Sativas or sativa dominant strains tend to produce more amber trichomes and indicas or indica dominant strains tend to have less amber and mainly milky trichomes when mature, so waiting too long for a heavy indica to produce amber trichomes can lead to harvesting nearly dead flowers and nearly dead flowers can in no way support healthy trichomes. Hope this helps,.............. Organoman.