Any preschool teacher mummies?

Hi mummies. I'm a preschool teacher currently in my first trimester. It's been really uncomfortable to sit on the small chairs we have in school but all our furniture are child sized. I noticed I have to use a lot of core strength to get up from the chair and move about. It's a challenge especially because I'm quite big sized. Wondering if any mummies facing anything similar and how you managed it. I'm a little worried it'll get worst once I'm even bigger. Thanks in advance ☺️