At how many DPO does Implantation bleeding happen?

Erika

I am at 9 dpo and even though yesterday I told my self I would let go of looking for symptoms, this morning when I woke up I felt a tiny drop and when I went to check it was very light pink almost clear. Then later today I went to the bathroom and when I wiped there was a bit more. Again light almost translucent.

I do not know if its implantation bleeding, or if I am starting to spot very early for a period that is due in 5 days.