Naschkatze, I'm in the same boat as you. Back to school for in service days next Wednesday, and no one there knows yet. In fact I went shopping last week specifically to buy loose tops to hide the belly (bulge more than bump atm!)!
Not yet decided when to tell them, (was going to a few weeks ago, but after some good advice on here, realised you have to just protect number 1 in some cases) as I'm on a zero hours contract which restarts next week. Doubt I'll get any maternity pay, and worried that simply they'll hire another teacher, and just say they haven't got any hours to give me.
I'll be due just as the Feb holidays start. To be honest, I was thinking before of working right up til then, and as it's my first, hoping baby will be late! Thinking now that was a bit over ambitious! And of finishing 2 weeks before, but have got a feeling it'll all depend on what the headmaster decides :-/ .
Same here too with the commute, 30 minutes each way, not sure when/if that'll stop becoming possible / comfortable.