Hi there StarFluff, a magnifier is really the only way you can tell for sure if and when to harvest because you can only really see the trichomes at 40X magnification and more. With a naked eye or at smaller magnification the trichomes will appear white or milky, even though they are not ready yet. So I would say that it is really important to get a magnifier. There are a few other methods that work a lot less well for example working off the pistils browning, which doesn't work very well and is strain dependent. If you have 3 dollars in your pocket I do suggest you get a cheap 40x + magnifier and check the trichomes directly for maturity because it's the only sure way to know what you're harvesting. I would give it at least another week before you start a two week flush based on the size of your buds, I do think they are still growing and packing on weight. I hope this helps ! 🚀