This all happened BEFORE anyone went to hyperspace. So when the Empire left the area, the Falcon was still in the sublight vicinity of Hoth. After which they scouted out and traveled to Bespin. Which leaves me asking, "How small is the SW galaxy if they can travel sublight between two different star systems?"
We can't affirm this. All we can see in the movie is the Falcon disapearing and Vador asking the commander to calculate possible hyperspace routes for Falcon.
Next scene is with Han and Leai in the Falcon's cockpit.
Nothing affirm you that they did not made few hyperspace jumps before dumping. Rember the Empire was looking for them. Which means that they had to jump out of space from time to time in order to scan the space.