Been trough similar situations. If you have been just texting but not taking, It’s better to prepare your partner (voice notes) for the big day, so that she is a bit prepared if it sounds kinda weird. If she is for you and she really likes you she won’t make it a big deal and will accept you as you are, with your stuttering and all other characteristics of yourself. Sometimes we may think that no one would like to date a person who stutter but there are out there, just don’t loose hope. Cheers bro