Try practicing in front of people such as your parents, sibling or friend. Another trick I use is to constantly remind myself to go 4 times slower than I think I should because I talk way to fast during presentations causing me to stutter more. My big tip though is try doing your presentation in a different voice and then eventually modifying that voice to sound at least similar to your regular voice. Practicing is a strange voice as if you are Obama or as if you had a Scottish accent it tricks your brain into thinking more about you talking. Try it for one run through and see how it goes, the more exhadurated the better. Then just work it down into something normal sounding, even if it doesn't sound like your regular voice in the end that can be your presenter voice like many famous public speakers have. If you don't usually stutter everyday and it is purely a nerves thing, practice a heap it will I promise. Try putting reminders on your presentation notes or remember where you will force yourself to take a break to reset and then keep going. To get rid of nerves acting as if you're playing a character instead of yourself can help. Play that character and lean fully into it using that different voice as I talked about before, putting a spacer barrier between the real you and the audience, always seemed to help me when I just lean fully into a character. Hope this wasn't to late but get some rest and good luck! Tldr; trying practicing in a different voice and see if you still stutter then work on getting that voice normal sounding.