Is this implantation bleeding?

I thought I started my period a week early which is very rare for me. I'm pretty regular down to the day and my flow. This came a week to the day before my period was suppose to come and has just been dark brown that turned to this and no real flow. It lasted 5 days and the last 2-3 were so light I didn't have to wear a PL. Yesterday was my last day of it. Was this just an early period or something different?