implantation bleeding?

My period isn't due until the 29th and today I experienced brown spotting. I'm hoping it's implantation spotting and not my period? I feel like it's way to early to be my period though. What have been your experiences with implantation bleeding?? My spotting was very light and didn't last very long. I know it's about the right time for implantation based on when I think I ovulated.