Hey, if you haven't got any wiggles still, it might be good to try the stethoscope again. I haven't got any yet that I can see, but with the stethoscope if I use the diaphragm side -either with the egg on its side on top of it or in a "nest" of a sweater to hold it up on the stethoscope end on the pointed end of the egg I can hear periodic thumping sounds, similar to if I were to tap on the egg -or the stethoscope end itself but quieter- but from the inside of the egg. Hopefully this means my emus are getting ready to do some wiggling. My temperatures have run low more often than they've run high, so I guess they might be a bit behind.
Temperature might tell you, too. I have a thermometer "gun" used for industrial purposes and reptiles, and lately the middle and pointed ends of my eggs have been several degrees warmer than the air cell end when I test them after they've been out for wiggle and listen testing, though I never let them get below about 89 degrees in the areas where chicks might be so I'm not sure if that's really that significant a difference, or it's just because egg fluids cool slower than air anyway.
I've decided to limit myself to only testing them at the midnight turning so as to not bother them so much, and besides my house is noisy with people around and awake otherwise.