How on earth will I be able to sit comfortably at my desk when my belly gets even bigger?

As it is, my belly is already protruding out far enough that I have to pull my chair back further so I'm allowing more room for my belly and so it's not hitting the desk!!
This then makes it awkward for me as I feel like my back isn't straight as I can't sit closely to the desk anymore.

How on earth do pregnant women sit at a desk when they are 30+ weeks?!?