Implantation bleeding?

Hey guys,

So my period was due 5 days ago. So it’s day 4 of my missed period. Yesterday I had some very very light bleeding and I thought maybe I was getting my period. But today there’s no blood. The blood yesterday was only when I wiped and wasn’t even consistently there when I went to pee. It was mixed in with cm and was kind of streaky looking, pink to bright red in color. I took a test yesterday and it was negative but with my period not having started and now the light spotting is gone I’m not sure what to think. Is it possible I could have had implantation bleeding this late and don’t have HCG levels high enough to test yet? I just don’t know what to think about this whole period situation.