This will appear quite alarming to admission officers, as you got A’s your first two years of high school. Considering junior grades are the most important, I would strongly advise you to work on those grades.
Though not a positive, I disagree with the above comment that two Bs in AP classes is “quite alarming.” That is overstating things. Better to have challenged yourself with APs. Agree that it would be good to improve second semester if you are applying to ultra selective colleges.