Yaay...yes, shipped eggs can be a gamble. Or, did you get yours from a local area. At any rate, shipped eggs..can be hard to hatch. You are lucky to have your own, and, I do not ever ever use the plugs. Oxygen. They need it.Good luck!
I actually got them local. I think it was bad directions not bad eggs. I'll know for sure if these that are pipping actually hatch.
Let's hope!