When did you have implantation bleeding and what was it like? Red, pink, brown???

I'm currently 8 dpo due for AF on the 6..... Tonight I have felt kind of like tugging I guess you would say in uterus above the pubic bone area... Also have some brown cm in my underwear and on tp when I wipe? Not saying I am pregnant not getting my hopes up either just curious on what happened for everyone else?