First semester senior grades

I am finishing my first semester senior year with all As in 3APs (English, environmental science, and gov) and As in health, business law, and Spanish. The only problem is that I put too much on myself and took AP AB Calc and am going to finish with either a C or D. I’m hoping a C but my final test score has yet to be posted and I could potentially be brought down to a D.
I’ve also been admitted early decision to Syracuse. I’m very worried about Syracuse seeing a D and rescinding my admission. I understand a C would not cause any significant affect, but a D definitely would.

Does anyone have any experience with this? Could my straight As otherwise save me? Very nervous.

PS) I also have plans to switch into a normal non-AP calc next semester which I must notify them of so I can bring up my grade and work at a pace more suitable for me. Any advice is greatly appreciated !