Implantation bleeding or really early period?

I'm 11 dpo and my period isn't due until 9 days I had really sore boobs last week and have now started spotting a yellowish brownish cm with a bit of pinkish blood afterward the rest of the day it's a light bleed that I only see when wiping. Day 2 I'm still bleeding but very light and had to put a pad on but still really light there no blood clots that I'd usually have an on pad and when wiping it a pinkish colour? I'm not due my period until 9 days an they usually at the end