Spotting.

This is kind of off topic, but i figured I would ask if anyone has went through what I am. I had some spotting 2 weeks ago and thought nothing of it, we'll I started it again and it has been on and off for 3 days. I'm not supposed to start my period for another week and I'm starting to wonder a little. My dr said that if it becomes every cycle then she would do tests... but she also asked me if I was sure I wasn't pregnant and I don't think I am. Anyone else ever had mid cycle spotting?