Stange Period/ Implantation??

Hi I am starting what I think must be an extremely early period, day 20 of a usual 27/28 day cycle. TMI but I woke this

Prenatal Development – Parenting and Family Diversity Issues

Will everyone experience implantation bleeding? - Quora

Implantation or period? - implantation bleeding?, Forums

Implantation Bleeding vs. Period: How to Tell the Difference

Implantation or just strange period?

IJMS, Free Full-Text

Implantation Bleeding?

implantation bleeding mistaken for period

Period Blood Colour and Smell: What Does it Mean?

Can I tell if implantation is happening? - Quora

For the Teen Who No Longer Wants a Period - The New York Times