Sounds like just a long-awaited correction of the 2 month long rally.
If it didn't happen, it would scare me even more. Also, if the stocks doesn't go down, how can I buy more?
Should you buy more? It depends. I have been dollar cost averaging on the stocks so it doesn't matter to me that much.
If you like to get in cheap, $475 and $450 are the psychological resistance level. I would get in at around $475. My short-term target is $550. News on IPad3, IPhone5 and (hopefully) positive news should get the stock there this year.
Disclosure: I am long AAPL.
Additional disclosure: I might increase my position in the next 72 hours.