What do I do if my results are not ready before a conference?
I would recommend another option: present the current truth of your work and results. You can get feedback on the methods and approach and somebody may even be able to point out adjustments to your approach that may help the work. Even just talking to people outside of your lab can be an important part of developing as a researcher. Don't try to hide the state of your work or pretend you have more than you have: people will be able to tell and it will not help you. Instead present yourself as you are: an early student looking for interaction around these ideas.

Note, of course, that this is all subject to your professor's approval: they know your community better than random strangers on the internet.

Finally: let this be a lesson for the future. Don't give in to pressure to claim results that you may not get. It is always better to say "And here are some new results not mentioned in the abstract..." than to explain why you can't deliver what you promised.