Implantation bleeding?

Period was a week early and lasted 3 days instead of 6-8 days, and was VERY light. Implantation bleeding?

My period is never early. And it's always heavy and lasts damn near 8 days. Now, my period is a week early, lasts 3 days, and is lighter than anything. And it's now almost a week later and my breasts hurt. Do I need to take a test?