9 days late, no positive?

With my son the test showed up just fine when I was pregnant, so I don't know why it wouldn't now. I've had good symptoms; Exhaustion, sore , minor nausea, and VERY light spotting a few days before aunt flo was due. I'm not sick or stressed, until I got so late I wasn't worrying about being (or not being) pregnant. Diet and exercise haven't changed... I don't know what to do.