Start the car, put it in gear and move. If you hear a big "snap", you got the pads loose. Hopefully that is all there is to it. Problem is if caliper pistons are stuck/seized too. That's another story. You don't want to drive far with sticky pistons because they will heat up and you get boiling brake fluid a.k.a. no brakes
Trust me, been there, and you don't want to be there and done it. Be very careful and check that calipers move and are not sticky before driving far.
Good luck,
Bert