Your credit card will not be charged for the purchase until it has been processed for shipping (usually within 24 to 48 hours). In the case of a sold out or cancelled order, your credit card will not have been charged.
A standard 'Pre-Authorization' is completed with each order placed. This is NOT a charge on your credit card. It's simply a verification of the available funds on your credit card. The 'Pre-Authorization' will be automatically dropped by your banking institution once the purchase is complete.