What should I do if my visa is about to expire and my son's passport is delayed while I'm pregnant?

I need some advice. I was planning to get a guardian visa depending on my sons ED visa.

Unfortunately my current visa will expire mid October and we still don’t have his new passport back from the UK embassy. Before we don’t have the passport we can’t kick start the visa process with the school. His current passport expires 12/19.

Iam currently 4 months pregnant and Iam not allowed to fly after 6 months of pregnancy. If the visa stuff won’t be ready in time I have to apply for a single entry tourist visa which will give me another 3 months.

But then I would need to leave the country 2-3 weeks before my due date (by land, since Iam not allowed to fly anymore).

Any suggestions what I can do, I really want to avoid traveling by bus heavily pregnant and worst case getting into labor in a foreign country 😅 if the Baby decides to come early.

I was considering MEV in my home country but would then also have the problem of being forced to do border run after 90 days.