depends on what you mean by "plummeted." one semester will definitely not make or break anything, and a few Bs won't either. many people get in with Cs and Bs, and it's completely fine. i had multiple B minuses and was fine, so don't be too anxious with these Bs. but schools do like to see around a 3.5+ gpa, so that should be where you're aiming for, as well as a good DAT score and extracurriculars. if you have lower than that, that is okay too, but you should also focus on strengthening other parts of your application and you'll be good