Was it implantation bleeding?

If you noticed the pink CM 6-7 days after you ovulated then that could be implantation bleeding, which happens in a small amount of women when the fertilized egg implants itself in the lining of your uterus. It varies from woman to woman but implantation can occur anywhere from 5-10 days after the egg is fertilized and a pregnancy test will not show a positive result until the egg is implanted. The HCG levels double every day so the more time you wait to test the more accurate of a reading will be.