You’ll be charged only after a successful crowdfunding campaign unless you choose an instant payment method like iDEAL. It means the project must reach its funding goal in the campaign. Adyen will try to charge your card for 2 weeks after the crowdfunding's end. Until then you can change your card if your payment was unsuccessful.
The campaign is just the beginning - you helped fund the project but please come back later, once the pledge manager is opened (usually a couple of months after the campaign is funded). It's a crucial step. You need to fill in all the billing and shipping details and make the necessary payments.