This morning there is a swarm in the top of a tree about 20 ft. from my hive. The hive has been very full the last while so, I figured they had swarmed... My question is, should I be able to see a difference in how full the hive is? It is a TBH with a side window, and when I look in the window it seems to be just as full as it was yesterday. Could this be just a wild swarm, should I be able to tell that what's in the hive is smaller? I'm new to bees and have never seen a swarm before.