That’s actually awesome though that your fear came to life. Now you know you can survive it and use the experience as strength going forward in life. Now you don’t have to feel a need to dwell on an imaginary fear, because it already happened. But I think you should tell the teacher ahead of time that you stutter sometimes so would like an extra minute to speak. Or even after class ask if you can present your ideas to her. She shouldn’t be judging you based off of something medical like stuttering, so tell her that that factor should be canceled out all together. And that you prepared yourself and should only be judged based off that. And if she had any question on how much you prepared, she can test you directly after class.