Apple Murex Eggs hatch…I think

Its been a few weeks since the snail layed her eggs on the inside of the cockle shell in my fish tank.   Its been roughly 15 days and I think it takes 28 days for the eggs to hatch.  However, the eggs are looking a bit different these days and my son, Travis, and I were observing them with a magnifying glass and noticed a critter of some kind poking out of one of the sacks.  Hummm.  Stay tuned.