Implantation bleeding?

When I went to the bathroom after sex, I wiped and in the sperm there was a light about of blood and pink blood on the tissue. 8 dpo , could this be implantation bleeding or bleeding from irritated cervix or start of period?

I am 3 weeks from the first day of my last period. I took a pregnancy test 2 days ago and it was negative but might have been to early. Thoughts?