Granny, the Serama eggs we set under broodies hatched on day 20 or 21. The couple that hatched early were probably eggs that were discovered late and had been sat on for half a day before they were officially set. It was broody chaos then, with 5 hens taking over all three nests and the non-broodies trying to squeeze in to lay where ever they could.
All eggs with external pips hatched and survived. I didn't open the non-hatchers.
Here's some more pics for inspiration. I hope you get 4 beautiful chicks!


All eggs with external pips hatched and survived. I didn't open the non-hatchers.
Here's some more pics for inspiration. I hope you get 4 beautiful chicks!