HELP! in registering to PEARSON VUE!

Thanks i just did that but had a new prob. I just registered to Pearson today to sit for NCLEX-RN. Everything went well with the payment but I just realized in the end that I didnt put a username. I dont know how did that happened coz i was able to continue with the process without it. How is that? Will i be able to be given a chance to create a new username or they will give me new one and a password also without paying again? And also I wasn't able to write down my order number coz i was expecting that a receipt will be email to me. Is there a chance that I can retrive the order number? Im so confuse right now. I just paid $200 and don't want it to be put to waste. Is the acknowledgement that I will receive in 72 hrs will contain my order number and username? Pls help me. Thank you.

Thank you gorgeous. I really feel like crying now becoz of this. For now, i am just waiting for their email of "receipt/acknowledgement" and their answer for my email re this prob both inbox and bulk.;( And i am already trying to call the credit card company hopefully everything will turn out good. My problem now is the username? Do u think I can still have a chance to get a username again without paying?