When you get back, take a look at the Troubleshooting form and fill out as much of it as you possibly can. Pictures would also be very helpful, but not entirely necessary. Yellowing is pretty common in the late stages of flowering for many strains, but just to be on the safe side, still fill out the form.

Welcome to the forums! We'll see if we can get this thread moved over to the Plant Problems section, too. Should get more views that way. Take care. :jointsmile: