Is it possible to do the marriage visa extension/renewal without my wife, if I have a letter from her hospital?

My marriage visa extension expires on the 27th November, I put the 400,000 into my bank on the 18th as I got the date wrong, I believe I can still do the extension on the 19th November as that will be two months and I'll just get a stamp staying I return on the 20th December. The issue is that my wife is due to give birth on 21st November, if I am "lucky" I'll have to go to immigration with a 9 month pregnant wife, however I can see a scenario where my wife gives birth early and can't go to immigration, do people think I can go in with a letter from the hospital explaining why she can't come in?

what documents is require to extend visa?

and what if i misplaced my white card, how do I

come about?

Hi tod i would like to know the process for one month extension if i get the letter from the hospital that i can not fly due to some medical reasons