everyone has given you the correct answers here......
I think sometimes guys are confused, thinking they "lockedin " a line......cuz in other sports, basically you do....If the lines come out in the middle of the week, and u bet Dallas (+7) against the colts, then they announce Peyton won't play, and Dallas goes to (-3) favorite, you still have your Dallas bet, and a good one....
NBA you bet PHX (+6) against the lakers, then Kobe pulls a hammy in warmups, line drops but u still have action......
But to be safe, always go with "listed" for your pitchers, then this cant happen to you