I got my 2 packages on May 11th, and one hive has built 3 full frames of honey, pollen, and capped brood about to emerge, and it seems to be on schedule. The other, though is not building much at all. Mostly just empty wax cells. I saw no brood at all, and I am a bit worried that they won't survive. Should I combine them, on the assumption that a queen was lost?