Could it be implantation?

Hanna
So AF is due tomorrow 6/12. On Thursday 6/8, I got what I thought was an early period (5 days early). It started light pink and then got to bright red and medium flow. I thought for sure it was just AF early until today, it just stopped. One day before my expected AF. 
It only lasted 4 days, and came 5 days before expected AF....could it be implantation and should/when should I test?