About 6 weeks ago, I made a split on a hive that seemed to be preparing to swarm. The nuc is doing fine, but no sign of a queen in the main hive. A week ago I gave them a frame of brood/larvae, but but no sign of their creating a new queen. I saw some spotty larvae, which has me nervous that there are laying workers. If this is the case, I'd rather not waste a good nuc on them. How can I be sure? If it's early in the laying working cycle, do I have a chance of success if I combine the nuc in?