i agree with theseamster and also i think you should take some serious time to think about what you truly consider a "woman's body" and a "man's body" and all the variables and such in between and the fact that your partner's body isn't going to ever become another person's body. it will be the same body with changes. changes varying on whether they take hormones, how much and how often and for how long.
i think a helpful thing would be to drop your preconceived notion of how your partner's body is going to change and how they feel now that you know they're trans
basically let go and accept what comes as it comes because it's an organic individual process that you can't control or predict
try to just go by how you're feeling now and how you have felt in the past instead of focusing on how you think you might feel in the future. the two of you can shape your future together with openness and honesty

easier said than done but it's worth it