Puncture wound in the knee from a metal spike, didnt bleed?

i did it at work, went through pant leg and i know instantly i did something. i look at it and its a hole a little bigger than the eraser of a pencil. i put a band aid on it and at the end of the day it hardly bled at all, and it hasn't scabbed over. is that normal or should i be worried? Also it never really ever hurt that bad, just a little sore. thanks for any advice!