I had implantation bleeding, it was a brownish pink discharge that only just reached a pantiliner, it started early on 9DPO and ended in the evening on 10DPO, I got the faintest line on a frer on the morning of 10DPO, but got a much clearer line at 12DPO. I think it can vary a lot but I'm sure some other ladies will give you their accounts xxx