References after Interview

I recently interviewed for a PHN position on Monday and thought it went well. I am a new grad RN and have been at my current job for about 3 1/2 months. When they asked me why I was looking for a different job after such a short time, I was honest as I told them I felt acute care/hospital nursing was not the right fit for me, I had always had an interest in community and public health and wanted to continue my career in that area. I found out that they called my current manager on Thursday as a reference for me which I was fine with. So my question is this: is it a pretty good sign when a prospective employer calls your current manager for a reference or does it not really mean much at all? I'm just not quite sure what to think. Any advice and answers would be greatly appreciated! Thank you!