Amazing news! Just enjoy the date. She agreed to meet you because she likes you, so tell her you have a stutter, its okay. If she has a probelm with it, its her loss and she is not worth. But very likely she wont care!! if its meant to be, its meant to be. Please dont stress about it. You must be very young and you will have these experiences, some will be good some will not as good. But these are things you learn from. Good luck! And please have confidence and dont forget to enjoy yourself!!!! :))))