How long did your implantation bleeding last?

***TMI PIC OF SPOTTING INCLUDED***

Sorry if it’s too much but I honestly need some input. I have been bleeding/spotting for the past two weeks. It’s mainly dark brown and sometimes light pink when I wipe. In the beginning I thought it was just my period but it was definitely different in color. And when the bleeding persisted, I took a pregnancy test and it turned out to be positive. I have no pregnancy symptoms or cramping. Could I be miscarrying? I thought implantation bleeding only lasts for a couple days so I feel like it can’t be that. If I actually am pregnant, I’m 6 weeks along.