Spotting before period

I'm just wondering, has anyone had any spotting like 3 or 4 days before period is due? For my lifetime that I've had periods, I've not once had spotting before a period until this month. It started on Saturday and its been on and off, sometimes its a tingy pinky browny colour and other times it's just my usual clear discharge. Also, I've had pads on for a few days now and I've not had one drop on the pad, just when I wipe. Any help or advise would be greatly appreciated.