Can someone please help put my mind at ease here?

When I registered on MBA.com I used the first name "Dave" without even realizing it. Of course on my identification, my name is entered as "David".

I scheduled my GMAT this morning, and now that I'm reading about their strict "your name must match in both places" policy, I'm starting to panic.

I called the test center I registered for, and they said it shouldn't be a problem since Dave/David is such a common nickname, but I'm really stressing about it.

Has anyone had a problem with this kind of thing? Thanks in advance!