I wrote the wrong registration number for my SAT Subject Test?

Is there any way to relocate my answer document? This was my first time taking this and I did not realize you needed anything on your SAT receipt, so I did not reprint it when it came out very small. As a result on test day(this morning) I couldn't read my registration number and wrote one number incorrectly while filling out my info on the answer document. Is there any way to fix this? I really really would like to fix my error and receive my scores! Please help! :[