You can look at calling yesterday as a negative thing or a positive one. If someone took the initiative to call me about a job I had interviewed them for, I would see it as they were very interested in the position. When the decision is made it won't come down to one phone call from you, though - it will come down to who they think is best suited for the position.

Beating myself up never makes me feel better, rouge. You did what seemed reasonable and according to what they initially told you - that they would make a decision by the end of this week.