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

What is spotting? Spotting vs. period, The Fornix

Early signs of pregnancy that can tell if you are pregnant, even before a missed period

What Is Implantation Bleeding? Symptoms & Timing

Watery Period Blood: Is It a Sign of Pregnancy?

Period or implantation??? - Trying to Conceive, Forums

What is Implantation Bleeding? - Dr Andrew Orr

Can I tell if implantation is happening? - Quora

Implantation Bleeding vs. Period: How to Tell the Difference

Implantation Bleeding: All you need to know - Clearblue

Can I tell if implantation is happening? - Quora

Implantation Bleeding: What Is It and When to See a Doctor