Negative on 7, 9 and 11 dpo. Sudden pink spotting on 11 dpo evening

Qiff

Hi ladies!

I tested on 3 occasions which are on my 7, 9 and 11 dpo.

Went to the toilet this evening and spotted some light pink discharge on my undies. Can this implantation bleeding or AF came early? Expected AF is either Friday or Saturday.

Help please!