Light period or implantation spotting?

Saraya
Hey ladies i'm just in need of some advice!
i have been getting my period every six weeks usually on time wich is normal for me. 
my last normal period started on the due time 25th of June ending on the 29th.
i was then due for my period around the 10th of august as my cycle is 6 weeks not 4 but there was no period.
on the 18th of september i notice a small amount of brownish dc and i thought ok my period has finally come i put a tampon in and hours later the tanpon was hardly stained. I then checked to see if there was anymore and there was just more brown/light pink dc but only a small amount and a drop of light blood. After wearing my tanpon all night this morning it was again very lightly stained with brown/pink dc and i didn't have any remaining dc. 
i'm not experiencing cramps only tiny ones it dosent feel like a period at all and usually when i get my period there is a lot of fresh blood and quite heavy. 
i am just wondering if this sounds like implantation bleeding? 
Personal experiences would be much appreciated!
Thanks Ladies!