Grades/ Rescinding

It’s second semester, senior year and I have been accepted into Indiana University since December. I have wonderful grades my weighted GPA ranking 3.9. However, AP Calculus just kills me. The semester is almost over and I currently have a D (65) in the class. My constant fear is to have IU rescind me. What are the odds of that happening?
Grades
Government: B
AP Calculus: D
AP Literature: A-
Sociology: A
School Magazine: A
Internship: A

I would guess the odds are very low unless you need better than a D in AP calc to graduate high school