TMI! Sorry

Period isn't due for another almost 2 weeks, and I started bleeding around 10am. This is all that I've bled since this morning. So in like 7 hours. What do you guys think? Implantation? Or somehow my period is early and light?
UPDATE: I should've mentioned my cycles are almost 40 days. So it's more than half way through my cycle as I'm bleeding. Next period is in like 12-13 days.