Hi. I'm a significant other and am also new to this. We live in a small town, too, and that is one of my biggest worries. My spouse doesn't dress publicly in our town, and I'm not sure when she will go full-time.
Personally, I'm not too concerned about labels. I've always identified hetero, but perhaps it turns out that I'm bi. I just know that I love my spouse.
Good luck to you and your fiance(e).