What is this?

[Endo_HATCH]

It’s a day before hatching and in one of my eggs there is a small dark blob in the air bubble.

 

[MGG]

It’s a day before hatching and in one of my eggs there is a small dark blob in the air bubble. View attachment 2147061

It may be an internal pip. Can you get a better pic in a very dark room? Candle the egg upright. Here's an internal pip pic. It's nice and clear in this pic.