Sorry to hear about what you and your fianceé are going through. That really sucks, especially considering that you have both been so careful. Pretty unfair, life.

I hope you both weather it fine. Some people seem to experience almost no symptoms; I hope that is the case here. Maybe she only got hit with a small viral load given how safe she has been... in which case hopefully her body is able to defend and create antibodies. Would be curious to hear how things evolve for you, if you’re willing and able to share.

Good luck.