Well, after they lay an egg they will sit around for awhile sometimes to enjoy their egg. But personally I don't bother trying to hatch pullet eggs. They are too small and if a chick did form, it might not be strong enough since the egg is so small.
A pullet is a first time layer(young hen). Thier eggs are smaller at first..then get larger with time. Most people do not hatch them out due to size. It is also likely they will not be fertile.