When it’s hot, I wear Dawgs (rubber?) sandals. They’re very comfy and I wash them with soapy water each evening so my feet stay fresh. I bought them from amazon uk initially but now I buy direct from the states.
I wear vans trainers that have a hidden platform - they’re comfortable and the heel rather than being totally flat holds my posture a bit better - in also 38 weeks pregnant (and still working [emoji24]) so they’ve been really comfy