Calling about interview

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I applied for a Help Desk Tech job at a local IT consulting firm a few weeks ago. I immediately got an e-mail about an interview and had a 15 minute phone interview a week ago. They said they would contact people about scheduling follow-up interviews at the end of this week. It's Thursday and my day off and I have yet to get a phone call or an e-mail.

This is a step up from my current job which I absolutely hate. The gentleman I spoke with on the phone seemed to be able to tell I knew what I was talking about, but I'm getting super nervous about not hearing anything yet. I'm not sure if I said something they didn't like in the phone interview. I just told them about my background, told the man I wanted the job because it had more intellectually challenging job responsibilities and the job duties were well within my capability. Asked for a modest salary that was above the one I currently earn.

Is it appropriate to just call them today and ask for a heads up? If so what should I say. My brother who works in this field already told me that doing this almost always lands him the job, but I'm afraid of sperging and killing any chances I already had.