I installed a nuc in my first hive a week ago. Yesterday I went through the hive frame by frame. There are a ton of bees, I found the queen (pic below), and they're bringing in lots of pollen. I'm going foundationless, and they're drawing out the two empty frames really well, and building the comb right down the center of my triangular comb guides. But I didn't see any eggs or open brood. Should I be worried?