How to know?? If chemical

Hi there. I have had my last period 16th May.

(3-4days weird colour light bleed/spotting)Implantation on 12th June

And nothing this month. But since 7days after implantation-which I thought was a strange period I took a test it was faint positive. And nothing But faints since then until today

^that was yday. Is this normal?