Sometimes even with movement you can have a bad egg. We have had some that have tried to hatch and if they don't hatch in time explode chick and all~ I would say open the top slowly and carefully and not to put it back in with the others. If it does explode then all your other eggs have a chance of going bad. It is already ucky then their is something wrong because that is not a normal hatch. Are you sure of your hatch date? This is just my 2 cents it is your chick do what your gut is telling you to do....