Hi,
I did my 2nd FP more than a month in advance, they didn't have any problem with that. However I feel now that it was a bad idea. My RD/ND is Sept5/12. My scheduled 2nd FP was in Mid June, I did it early on May 11th. However I am still witing for approval. I see a lot of others with RD/ND in Sept and who did there 2nd FP in June on their scheduled dates already got approvals. Only a bunch of fools like me who jumped the gun and went early are still waiting. So I advice you to wait for your scheduled date!