Implantation TMI

For anyone trying to figure out about when you implanted and when to test i totally recommend:

(estimation implantation calendar Calculator)

I had triggered myself on the 28 of April and went for a blood test on Tuesday and came back negative but on this Calculator it says i tested early. I bled this morning and little bright and dark blood but it went away so i also hoping its implantation and It might be that I still have hope.