I wish I could offer some real world advice, hun. But I'm not quite there yet in my own relationship.
There's this post(and other stickies posts like in significant other board, etc) that I think might help answer a few questions/concerns:
https://www.susans.org/forums/index.php/topic,220120.0.htmlFor me, I think one big concern for many spouses is not being necessary to the relationship, as they are a cis female, at least in my case, even before becoming trans my wife has expressed concern of me not needing her because I work and do most things a traditional wife would do.
For me, I am a little concerned my feelings might change, but I really think being trans just helps clear the path to your emotions. Things you loved before, you now love even more, it's like increasing your capacity for it since you're no longer limiting yourself.
I do hope things work out for you two, and good job on telling her! Hang in there, girl!
Sorry I wasn't more helpful(or at all lol)
Much love,
Eryn