All stocks, and all trends follow the same rules. They go up, and they go down. They can trend in one direction or the other, but on the path of that trend they always both go up, and go down. AAPL has done nothing but go up for over a week. It's well overdue for a retrace.
Especially in light of losing patent infringement lawsuit with Qualicom, not to mention technical analysis, it's way over due for a retrace, at the very least, if not a course correction.