Check back in a week, maybe two. Looks early to me.
*EDIT* If you do get a scope, look at the buds and not the leaves, the leaves trichomes will mature quicker than the buds.. You also want to check multiple spots on multiple branches to get an overall idea of %, and when looking at trichs using a scope, check from the side of the mushroom shaped trichomes, instead of looking from the top down.( Sometimes trichs will look cloudy if viewed from above when the cap is really just clear and your seeing the stalk of the trichome from below.)
Also, I wouldnt even pull the scope out until you dont see anymore white pistils. (I didnt write these pictures, just showing you the images, I actually wouldnt call the text in these images accurate, was just trying to give you idea of what the trichs look like at different stages.)
Last thing... If you dont have a scope... fuck it, dont even get one... best thing would be to learn to identify a ripe ready to harvest plant just by looking at it... Youll notice after a while there is a distinct difference in when the bud has swollen up to its max size, Then from there youll have a few days to pick your desired trichome maturity (cloudy:amber ratio)
I dont think the scope is necessary.. Think youll become a better grower without it TBH.. Last thing... new growers (even growers who have a bunch of crops under their belts) almost ALWAYS harvest way too early... Just know, whenever you think shes really ready... Wait... Not only will your overall yield be way bigger, but the nugs wont be those airy fluffy nugs that people wonder what happened... They look so great on the plant, and when they cut and dry they are not dense at all, and may even have a hay/grass like taste/smell.. all of this because of harvesting early.. it wastes all the time and energy put into the grow up until that point... So if theres one thing you can do... is just learn to have insane patience when it comes to this.. I like to never have to rely on a current grow for personal smoke, youll obviously cut early if you're fiending for something to smoke because you dont have a stash to make it until after dry/cure. This seems to be the reason why a lot of new growers cut early..
Final thing Id say is.. you may even want to let a plant go longer than supposed to, just so you can learn first hand all the minute changes throughout the life cycle (especially the end of life stages) of marijuana.... You can pick some early, some "on time" and some late to get an idea what you prefer for future grows, and learn what to look out for.
Enjoy the time she grows just as much as you enjoy the end product. Cheers