Don't panic - and don't order again until you've worked out whether the first transaction went through successfully.
You can check your tickets at any time by logging in to your account here and selecting 'my tickets'. If your tickets are not listed here, it may be that you have duplicate accounts after registering more than once. If you think this might be the case, please contact our Support department from here.
If you believe that your transaction may have failed or if you are experiencing trouble purchasing tickets, please contact our Support department from here.