I Need Some Help?!?!

Whats up guys...i got a possible problem...i have one female thats like 21-22 weeks old...im not exactly sure how long its been flowering but it has to be like 11 or 12 weeks now. the trichomes are still cloudy with a few amber here and there. my problem is that a lot of the leaves are turning yellow and getting little brown spots on them... i haven't changed anything and haven't had any problems prior to this so i cant figure it out?? Is it just because the plants life cycle is coming to an end or is that not possible?? Ill try to get some pics but i dont have a camera right now...Any suggestions would be greatly appreciated...thanks

I'm probably not the right person to be giving advice being as hardcore of a novice as one can be.. but I recommend that you read the plant problems (with pic) thread.. If I'm not to stoned I'd say it's normal in the end of flowering, buds using up all the nitrogen or something.. check out the thread peace out!