Implantation bleeding?

I began spotting 6 days before my period it has been brownish reddish and will start and then stop and then start again. It's not heavy enough to need anything other than a panty liner to absorb the blood. It is fairly thick and sometimes just light pink. I am on my 4th day of spotting I am unsure if this is implantation bleeding or an early period. 
​Did you have implantation bleeding? If so, how many days did it last? What did the spotting look like?
​Any ideas on my situation? Thank you!