Did you call Disney and ask this question?
Did you look at your reservation confirmation?
I booked a trip for this fall in December. My reservation fine print says the following:
ROOM RATE REVISIONS FOR ARRIVALS JANUARY 1, 2013 TO DECEMBER 31, 2013: Room rates for arrivals on or prior to December 31, 2013 are guaranteed as long as room reservation is not changed (except for changes in tax rates or other governmental charges)
What Bama Ed is talking about, I believe is related to to reservations made further out than they have established room rates for. You did not book that far out.
So rather than worry, or cancel your second week, or get annoyed with Disney over something that may not even happen, why not simply call, give them your reservation confirmation number and verify the rate.
That will give you peace of mind for your final 500 mile drive.