getting D in my 2nd semester of senior year

I got admitted to UCI for Business Econ for upcoming Fall. I’m currently taking AP Calc AB, and I think I will be receiving D for the last semester. I talked to my counselor, and she said that since AP Calc is beyond a-g requirement, so my admission shouldn’t be in stake. But I was still worried.
I will be taking my final on Monday, so I’m not certain that my final grade is D. With D, I will still be able to graduate. If the final grade is D, what might happen??

You will have to call the admissions office or student support for that, the worse that can happen is your application being revoked.