What is implantation bleeding?

I think I started my period but not sure I’m a day early and been bleeding light all day it’s almost little to nothing I don’t fill up any pads and the blood it’s like a pink color on my first day of my periods i Usually bleed heavy I took a pregnancy test last night the results was negative I checked it again this... show more I think I started my period but not sure I’m a day early and been bleeding light all day it’s almost little to nothing I don’t fill up any pads and the blood it’s like a pink color on my first day of my periods i Usually bleed heavy I took a pregnancy test last night the results was negative I checked it again this morning and the second line appeared half way please help
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