Hi there, welcome to Scarleteen!
I'm glad our article on first pap smears was helpful to read! Hopefully it will go smoothly for you.
These exams are very clinical in tone, so it's very likely that you won't experience any arousal, but if you do find yourself feeling aroused, that doesn't mean you're doing anything wrong. Your doctor likely won't notice, and if they do they're trained to act professionally and ignore it.