Hi there OP,
Wishing you the best of luck in your hearing.
You have to be very careful with using AI to help you with assessments. Not only is AI very bad for the environment, it can give inaccurate information and prevent you from gaining the skills you'll learn from writing critically yourself.
Some universities do allow you to use AI as an alternative to google or to give you ideas or summary points on a topic, but using AI to write whole chunks of assignment is almost always not appropriate and can lead to penalisation (which you don't want and is really not worth it!).
If in doubt or unsure and your uni's policy on academic integrity isn't clear, then contact your personal tutor - they might be able to guide you on where the line is between using AI responsibly and irresponsibly. If it is a first offence and you are honest about it, you are not likely to be expelled.
Try not to worry about what's happened in the past, just take this as a learning opportunity!
Best of luck again, and best wishes 🙂
University of Bath