odd moving bug
Bed bugs range in size from the size of a pin head to the size of an appleseed. They are reddish brown, flattened and oval shaped. For a poster showing bed bugs and their signs, see http://citybugs.tamu.edu/ent-3015/
Bed bugs do run, but not normally in circles.
For more information see http://citybugs.tamu.edu/factsheets/biting-stinging/bed-bugs/