A little background.
I have a couple of nucs that weren't going anywhere. Neither produced a queen. I decided to combine them and see if that would help. After adding a frame of brood they did produce a handful of queen cells. Last week we noticed they were all open. Upon further inspection yesterday we noticed a a few small clusters of larvae and what looked like capped drone brood.
The larvae tells me someone was in there laying eggs less than 8 days previous. I didn't see any eggs so not sure if I have a laying worker. Thought it might be possible for a virgin to lay some eggs before she mated.....?