Have I ruined my starter?

There I was, feeding my starter and humming the little happy loaf song, thinking about the lovely loaf of "Susan's bread" I baked this morning and planning to start another one tomorrow. THEN I realized I had used all purpose flour instead of the Stone-Buhr bread flour! I have never used ap flour to feed my starters, and I am wondering what harm I have done? How soon can I change back and how should I go about it? Can anybody help, please? A.