Hi Joel,
Well...don't think you are alone in not having enough for a class period! That has happened to the best of teachers. My problem often was I had too much for students to do so became exasperated because the students didn't work fast enough or didn't grasp the lesson well enough to move it along.
I think you certainly did some "action research" with this experience in you always need to have some other "tricks" in your pocket for those kind of occasions. It would be good for you to have what we elementary teachers call "sponge activities". I have hundreds of them for the elementary level. So...if you would like to have some, let me know. They might come in handy when you go to Mrs. McLaughlin's class in a few weeks.
Good luck the rest of the week!!
Kaye :-)