Implantation bleeding is usually a small amount of light spotting, it doesn't progressively get heavier like a period, and it usually lasts for only a day or two. It's never enough to fill a pad or tampon like a menstrual period, nor is it a mix of blood and tissue like a period.
The color is also different than your normal period blood—implantation bleeding is a much lighter hue, typically a very light pink or light rust color.
Light bleeding or spotting, mild cramping, a woozy feeling, swollen breasts and headaches are some commonly reported symptoms associated with implantation bleeding.