First, don't be nervous. VC's are obviously looking for numbers. While base line numbers are important, there are obviously other factors. You have to explain what was accomplished in the month. IE building a product, getting X done with the process, or how what you did will get you to the next stage, is important. If you tried something and it didn't work, thats okay too. However you need to explain how your mistakes won't happen again and give a detailed explanation on how you've fixed those mistakes. Throughout the entire process don't answer too much. What I mean is, make sure you focus on the good and answer their questions but don't go too far off topic on what they are asking you about.

If at anytime they say they need to move on, its okay. But don't let go. Ask them if you can still keep them updated and if at a further point when you have more traction, if you can ask for another meeting. Good luck!