That’s my prediction for your viva.
You know your research, you wrote your thesis, you’ve prepared for the day. You’re reasonably confident, not arrogant, slight flutter of nerves because it’s important. There’s a few moments of worry – you don’t know what your examiners think, what they’re going to ask, if you’ll go blank on something or not – but you can probably feel pretty comfortable with the situation.
I would hope that you feel only a little uncomfortable, just a little, because when you think rationally you know why and how you’ve got this far. 17% uncomfortable means that you’re doing well.
And if you’re feeling more uncomfortable than that, what are you going to do about it? Who are you going to ask for help? What actions are you going to take?