11 dpo - all negatives.. 😪

I have a 28 day cycle, which I ovulated cycle day 14 on the 23rd of April. I had (what I think is) Implantation bleeding 6 dpo... I am now 11 dpo and still testing negative.

To my knowledge it should take 2-3 days after implantation to get a faint positive.

This doesn’t make sense to me! Some one explain please (: