I do agree that, unless your kid is demanding to use the potty, it may be better to wait. I've heard it can take over a month to solidify potty training, and having a newborn come in halfway through will probably throw everything off.
I know how frustrating it is to feel like you've got the perfect time to start, but some other aspect of life prevents you from. You could try if you want, but there are a lot of changes going on and it definitely can still work in a few months.
this is just a moment in time, step aside and let it happen