I'm currently studying at uni. Last semester, just for fun, I ran some of my old (pre-chatGPT) articles through various AI detectors, and several were flagged as AI-generated. Scared, I did the same with some of my assignments (totally written by me!), and two of them were also flagged. I spent several hours trying to make them sound "more human", before just submitting them.
I passed, but this semester I'm on saving a version of every article or assignment every hour or so. My thinking is that, if any of my work is ever flagged as AI-generated, I can show every step how the work developed from outline to final product. Hopefully that will be enough to prove I wrote it, but I'm still wary.