Congratulations on coming out to your wife - thats a
huge step

My wife didn't understand either, but she loves me and supports me - remember that your wife is starting at mile marker 0 while you are miles ahead of her. Its new, and potentially very scary for her to hear that (in her mind) you may not be the person that she married.
If i may offer a couple of pieces of advice:
Of course you are still the same person - periodically remind her of that. By doing this i was able to work thru gender related rough patches with my wife (she at first thought that i wanted to transition). And, don't bury her in gender related conversation either - let it happen when it happens. I know that you are probably excited and want to talk a lot about your feelings and the relief of finally figuring out who you are, but be sensitive to how your wife is feeling, and squelch that tendency to talk endlessly about it.