I have 13 pullets, 19-21 weeks, one good egg, the rest were too soft and broke, (3 in total) that was a week ago,
none since...so yes I believe it is normal, and the heat is a factor also, depending on where you live.
It is normal my girls have been laying for 2 weeks if you can call it that 3 eggs here none for 4 days another and then nothing...5 hens have laid there first egg and then ,,,well these girls will work it out,,but yes that is normal.