Hiya BallyBall81,
Being a bloke I can't answer the pregnancy specific queries, but one of your point was not knowing what stage of Kidney Disease you're at.
If they're advising Transplant needs are imminent but you've not yet started dialysis treatment then the most likely stage you'll be at is Stage 4 of a possible 5 stages.
Being at Stage 5 and on Dialysis as of last week my advice would be get in really tight with your Nephrologist. I now attend a joint Renal/Diabetic clinic and a separate Renal Clinic at my local hospital as opposed to trying to get the 2 to communicate so if this is an option for you I'd highly recommend it, it has made organising diabetes AND kidney related problems for me so much easier and I've never had conflicting advice or opinions since it started. I'm now at the stage where I am able to email my Nephrologist with questions or to chase things up due to the relationship we've developed and it's making the whole experience a lot easier.
The other thing that is worth doing if it's not already being looked in to is to get both the Transplant Registration Process started and the ground-work for starting Dialysis done as well, unfortunately starting Dialysis isn't as simple as TV makes out and you can't really just walk in and get connected up to the machines, there's 2 main methods for dialysis and both require preparation which at minimum should take up to 6 weeks so it's worth discussing these options now and getting things organised, than developing a pressing need for them, especially with a little 'un on the way, I'd imagine you're going to want to be ready to start at the drop of a hat when the need arises

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The good news, it is NOT as glum as it feel right now - the transplant success rates are massively high, well into the 90's in terms of percentages. The wait times in your area may be 5 years AVERAGE, but your individual wait time *could* be less, it breaks down in to blood groups so whilst type-O may be 5 years, type AB could be 1.5...best person to give you accurate data on this will be your Transplant Co-Ordinator (who is another person it's worth getting in tight with once you have one). The waiting list also works off of points and the longer you're on it the more points you get, so getting on it early in the process (i.e before you really NEED the transplant) is 110% worth doing and chasing up, there can be other factors (your pregnancy may well be one of them I don't know) that can bump the amount of points you get up so make sure you tell them everything when the time comes, you'd be surprised at how quickly you could move up the list just because you happen to have something happening. I'm 30 this year so not much younger than yourself and been told my age is a positive contributing factor that gains me points so you will probably find yourself gaining an advantage there as well

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Whilst it's a very serious condition to be dealing with and the pregnancy stress will likely make it seem even more daunting, and it will change a great deal of things about your life going forward, medical professionals tend do tend to paint a very bleak picture sometimes so they don't get peoples hopes up, but for every one story of someone having a tragedy happen to them during pregnancy because of Kidney Disease like they've 'warned' you about, I reckon there'll be far many more Cathys8's out there who had a great success and you have every chance of being one of them

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Sorry for the long post - but hope some of that helps!

Take care!