Please help. Thanks Everyone!

TSC
My I-140 was approved in April, 2005.
My hu*****and and I did fingerprint (code 1) in May, 2005.
But my hu*****and and I got fingerprint notice (code 2) again in March, 2006. My hu*****and’s appointment is one week earlier than mine. We must drive about two hours to get in ASC (application support center).

My question is:
(1) If I can do fingerprint with my hu*****and (one week earlier than appointment day).
(2) If we need carry our pictures.
(3) If anyone would like give me some reasons about we need do fingerprint twice.
Thank a lot!