Comfy seats?

[Msfickle]

I'm 27 weeks and sit at a desk all day. I work from different places but when I am working from home I am the most uncomfortable. I have an ergonomic stool which is rubbish because I end up with achy shoulders and back. It's also quite hard and uncomfy on my bottom.

I sometimes sit on an armchair but that's not the best either. Has anyone tried sitting all day on a pilates ball? Any other ideas without spending £300 on a fancy office chair?

i used to work with a woman that had damaged her back in the police and now worked in an office, she sat on a ball all day, loved it. only thing that was comfy. amusing if you saw her in the lift with it going to meetings.