You are just going to have to wait it out and monitor the development of the egg.I saw that you took it to the fish store for safekeeping until your tank is straightened out so hopefully it is not too inconvenient for you to get there regularly.....and my goodness at that photo.Most of those looked like they would be trouble for a very small young shark though.How would I know if the shark is dead in the egg? I tried shining a light against it but it looks to big to move inside the egg