Just continue to do your best and try and be as well prepared as you can be, it may well be less stressful than you anticipate.
If it is any consolation, the senior management team are the ones who will/deserve to take any flack for any issues.
They will be sh**ting bricks right about now, and if where I used to work was any yardstick, they might actually be seen around the school talking to staff and offering encouragement for the first time since the last inspection.
I experienced four inspections in my time, one as lowly classroom teacher, two as as curriculum leader and one as a part timer. Guess which were worst?
The worst ones were at the time when you had a couple of weeks notice…..that really brought out the ‘best’ in managers relationships with their staff
Actually I was only observed taking lessons in two of them, the others were much more paperwork based and discussions of internal standardisation/best practice for me.