Final Transcript Report Question --- Will a few Bs hurt me?

I recently got a likely letter to UPenn and I was just wondering if at most 2-3 Bs will make them, or any other top school I might get into, question my acceptance? My GPA already isn’t a 4.0 (3.89 to be exact), and with one of my extracurriculars taking up A LOT of time in the next month or so (I’ve had to miss school and it’s difficult to make everything up) coupled with a bit of senioritis (not going to lie about that), I might get a couple Bs this semester. I’ve heard about Yale warning students for only one B, is this true for Penn and I guess any other Ivy I might get into?

No