I did the same as PRMG when I was still working with DD1. I got enormous pretty quickly so had the keyboard against or on my belly from 5 months or so. I also had a lumbar support pillow that I used from about this time too

I'm finding the same issue with our dining table at home now. Its got waterfall edges and then a sort of cross piece that goes under the table top and I'm struggling to reach my plate to eat. Not good when I'm trying to teach the girls good table manners and I'm leaning all over it myself!