my white sussex have started laying too,
, (hatched june) nice surprise when my others have gone off lay!
dont be scared of hatching out, just accept that not all will survive, but neither will natural hatchings with a hen. our first broody hen experience was 2 hens fighting over who sat on the chick, and ended up flattening it til death between them, (now have a broody coop)
if ur gona incubate, get a good thermometer and a humidifier, neither are expensive. and try and find out what went wrong so it doesnt happen again.