well dont give up hope, and take a close look at your "trichome" or the "crystals" and see what color it is...

Clear Crystals means you do not have enough Potency...

Cloudy Crystals meanz you "CAN" harvest if you want, the high will be Energetic/uplifting

1/2 Cloudy 1/2 Amber meanz you "CAN" harvest if you want, the high will be equal body and head

All Amber Crystals meanz you can harvest now, the high will be couchlock....

Sometimes your buds will change color(Mostly purple) but it doesnt mean nothing sometimes, depend on strain but thats usually from cold weather...