Getting One B+ Senior Year

So I’ve had a 4.0 my entire high school but I’m in danger of getting a B or B+ in AP Calc BC my senior year. As I am applying to IVYS and schools like Northwestern, how much would that affect my chances. Would admissions officers find it bad that since, I’m only taking 5 classes senior year, 3 being AP, that the B would kill my chances?
Thanks

No, it won’t kill your chances at all. Stop being paranoid, you’ll be fine with 1 B+ senior year.

Sorry Tiger: you’ve been thrown out of Olympus to being a mere mortal. Welcome!

You’re fine. Try not to be so high strung. Here’s some advice for you: you know you’ll get your college acceptances by April right? That last semester: purposely nosedive in one of your core classes and get a “c” — it’ll do you good.