Implantation bleeding?!!

Hi! 
I was supposed to get AF on the 23rd, I started bleeding heavily on the 20th ( I assumed it's AF.) I normally have really heavy periods but today the heavy bleeding is practically gone and now it's just extremely light spotting, if that.(Not the norm for my periods at all)- I didn't have implantation bleeding with my first pregnancy, so was unsure if this could be it? 
Has anyone else had this happen? 
Thanks ladies! 

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