I think it’s a tough one OP.
If work asked you to go in extra, you’d probably not want to and be posting on here about advice on how to refuse. I’m not pointing out that to be horrible, just that it probably is tough for work to get the right balance in your eyes.
They seem to be thinking about you (or cutting you out depending on your perspective). Can I ask if your work is hit by COVID - I.e. will some ppl be made redundant? I doubt you will be, as firing a PW would be construed as unfair. But I can see why you might feel an unsaid pressure to impress, leave a positive impression before you go on mat leave, rather than being considered a lazy, pregnant woman who didn’t do much (I don’t mean these words - just trying to say it in a way that work might view you IF your fears about being cut out keep going).
It sounds like a small business. Mat leave always hits small businesses badly. That’s not your fault, and you deserve every penny of mat leave pay, but it will cost them. I wouldn’t be surprised if they’re trying to get things running smoothly without you. Be glad it’s not the other way...trying to squeeze every last drop of hard work out of you!
If you were less invested in you work, I would say, enjoy the lack of pressure. You may feel sidelined, but I assume when you have baby, you’ll be off for at least a few months - maybe a lot longer? And although technically possible to still build/forward your career at this time, most people press pause, as it’s not their priority.
That said, if you really feel a bit cut out/patronised, and don’t want to be treated any differently, then you should make this clear. Do everything you would normally. Or do as much as you can and WFH as you have been doing. When people make comments about baby brain, say actually studies show that pregnant women have better memory than non pregnant women, (apparently that’s true!)
Make it clear that work is distracting you from the uncertainties/symptoms of pregnancy and you’re eager to do your fair share and be fully involved.
In summary, I think you need to view your work as thoughtful and be satisfied. Try not to feel paranoid about being left out. Perhaps you are, but it doesn’t sound malicious.
OR
Communicate your desire to be treated equally/kept in the loop. That might be hard, especially if you’re not feeling great, needing time out for appointments etc. And is possibly not realistic. Why should you be kept up to date about stuff you might not be working on for example? You could make it clear you want to assess the risk...rather than them deciding for you.
Only you will know your workplace though. How have pregnant women been treated previously? Do you get on with colleagues/boss?