Use of AI for Assignment.

I have used AI for generating outline for my assignment and have submitted it. I usually check my AI generated percentage through ZeroGPT and GPTzero. While checking it showed 0%- 5% AI detected. Almost all the part of my assignment was done by me.
My friend has suggested me to use Copyleaks and scribble AI detector. While I did so significant portion of my assignment shows AI generated (around 60-70%). I have already submitted my assignment. My University uses Turnitin.
Now I am affraid what will happen. I have heard that they will expell the student if AI use is detected. I am soo worried right now. Can anyone help me ??
Can you suggest some AI detector which are relaible for Turnitin.