lol, damn kids, the quick answer is yes, if u let a plant bud for to long the thc will degrade over time but i wouldnt be worried about that in your case, most people think their plants are ready to harvest well before they really are.. if u can, get your hand on a magnifying glass/microscope thats atleast 30x, maybe even 50x (i have one for 60-100x, works fantastic) to see the trich's, then u will know for sure.. if u cant get ahold of one follow the rule of thumb, wait till the hairs are about 75% brown, usually means u can chop her down. and if u do get a chance, pics are helpful... very helpful
cheers, chrome