hey its ok!!!!!!! Its very common!!
I have it with both pregnancys. .. your not linked to anything, your not on a drip etc.. so yes you can RUN around if you want..
They just insert an IV into your hand (they usually do this while in labor anyways) and then every 4 hours (i think) you are given a shot of anitbiotic through the IV.. Honestly its not a big deal at all!!

Chill