Northwestern coach Pat Fitzgerald is happy to be 3-0, though he sees no cause for celebration yet.The Wildcats are ranked No. 17 entering Saturday's home game against Ball State. Their 16-6 win over then-No. 21 Stanford to open the season looks even better after the Cardinal beat a sixth-ranked Southern California last week, and the Wildcats are coming off a 19-10 road victory over a Duke team known for its offense.