In 8th grade I received two B’s (haven’t gotten any since). At my school they count our 8th grade grades and it is factored into our gpa. Will colleges actually care about those grades?
no middle school does not matter
If 8th grade is factored into your HS GPA, that’s extremely out of the ordinary. Colleges don’t look at anything earlier than 9th grade, and some even later. But they do look at GPA’s, and unless it’s somehow clarified that it includes grades that typically aren’t, I suspect they won’t know the difference.
But most admissions offices will look at the transcript, course rigor, some will recalculate the GPA in their own way, etc.
So no, it’s very unlikely to matter. And you can’t change it now, so it is what it is.