I was in my first real interview just a couple days ago. Went really well, I know my stuff. I never told them I stutter because, well, they could hear it. They didn't ask either and never reacted strangely or anything like that when i got caught on some sound. At the worst my stutter was 2-3 repetitions at a start of some word, and some blocks here and there that I concealed with "uhm..." or just a small pause, waiting for my breath. ​ The absolute worst thing you can do is cancel. If you cancel the next (inevitable) interview will be much worse. We're all rooting for you man, just go do your best!