So I have some fantastic news!
My first 3 emu eggs are on day 38 and I've seen no wiggling yet sooooo... I used to be a vet tech and decided to try the stethoscope. I heard chicks in all 3 eggs! I'm so super psyched! And now I know it works so can do with my next set of 3 as well!
To do it I used a dual head stethoscope with a bell. This is important because I used the bell side of the stethoscope. If you don't know about stethescopes, the part that conducts the sounds to your ears can have 1 side with a diaphragm, or 2 sides, on most of which is a bell on the second side. To use the bell instead of the diaphragm, twist the end 180 degrees. I then put the bell over the pointy end of the egg and tapped and talked to the egg. I could hear the chick talking back to me!!! Since they haven't pipped the inner membrane, you can not hear this sound without the stethoscope. It was really cool and anyone still incubating eggs should definitely give it a go!
I am including a pic of the bell side of the stethescope. Happy listening!