Just finished reading your post here and I have to say that I do understand what you are going through and what your Dad is going through, as my dear Dad is also very ill with Motor Neroune Disease. He has had it nearly 4 years now and up until 3 months ago he was doing ok, but then he was having troubles eating and drinking and now has lost heaps of weight and is very weak because of it.
He has to have a feeding tube put in and hopefully that will help him even if it's just alittle bit.
I too know that my dear Dad is dying and Mum said that it seems like he is slowly giving up now, just doesn't want to fight so hard anymore. I understand why, as this bloody disease takes such a toll on Dad's body, he is stuck in a useless body. His mind is still great, but his body has given up on him now.
As much as I don't want my Dad to die, I know that it's going to happen and in the end I will be so sad to say goodbye, I will also be relieved that he will not be suffering anymore.
All I can suggest to you is, to take each day as it comes, enjoy every moment with your Dad that you both will have together, tell your Dad daily how much you love him.
How long do you have to go before you give birth to your Little One? Hopefully your Dad will be around to see him or her. That would be a wonderful thing for the both of you to look forward to, also just remember all the wonderful times you and your Dad have had over the years, no-one can ever take those things away from you. You will always have your Dad in your heart close to you, he will always be around keeping an eye on you.
God Bless your dear Dad and God Bless you as well, please Take Care, Love Kelly.