There is no clearcut answer. You can hatch pullet eggs. You can often get decent hatch rates. There are some possible issues though.
Sometimes it takes pullets a while to get the kinks out of their internal egg laying factory. We often notice that in the shape or size of the eggs, but that can also involve unseen parts, such as nutrition. Digits posted a link about that in another thread today. I was not aware of that before I saw that thread. So it is best to wait a couple of weeks at least to give the pullets time to straighten out all parts their internal egg laying factory.
Another possible issue. When they start laying, the eggs are smaller than they will be later. They gradually get larger. But the pullets shell gland can make enough shell material for a larger egg. The result is that the egg shell can be pretty thick. Remember I said you can get decent hatch rates, so this is not always a problem, or not even usually a problem. But occasionally some shells are so thick the chick cannot pip and zip. Minor issue.
The real issue with me is that the pullet eggs are usually pretty small. There is just not enough nutrients inside that egg for the chick to get to a large full size like it would if the egg were a more normal size. The good thing about that is that there is not enough room in the shell for it to fit if it got big anyway. But that means the chick starts out small. I've hatched pullet eggs before and my survival rate in the first 24 hours was not as good as it normally is with regular sized eggs. Other people have not experienced that, so I can't say that happems every time. It is just something that happened with mine. It is certainly possible the small size of the chicks had nothing to do with the mortality rate I saw. All those of mine that made it past the first 24 hours did great. It was just that first day that was rough.
The ones that made started out small never seemed to totally catch up in size with others. If you are raising them for meat, that might be an issue. If you are raising them for pets or eggs, it probably does not matter.
With all I've said, unless you are raisng them for meat, I'd wait about two weeks after they start to lay before I tried to hatch any just to let them get the kinks out of their internal egg laying factory, then go for it.
Your real issue is that you cannot control when your hens will go broody. It is pretty unlikely any of your pullets will go broody until long after they start laying. They may not even go broody at all. You just can't control that.
