Don't be affraid to drive it, just let it idle for a while and maybe take it around the block. See how it drives and let me know. If the coolant was that low the car could have begun to overheat causing the computer to shut down the engine until it cooled off. Like I said, let it idle for a while, but watch for any coolant leaks and watch the temperature gauge. The coolant has to have gone someplace. Let me know what happens.