Implantation bleeding six days after???

Has anyone had implantation bleddding six days after conception. My last period started on the 21st. Conception was on the 28th and I started bleeding today bright/dark red. I put a tampon in because it seemed more than a pantiliner worth, but have only changed it once today and it barely had anything on it. Just maybe half in light red. Early period stimulated by sex or very early implantation bleeding. To early to test. Tuesday would be 10 days which is recommended for home tests.