Queen bee or No Queen Bee - that is the question.

Maybe I should listen to my wife. She told me 2 days ago that she was in the front yard spraying off the driveway. When she was out there she heard a loud buzzing noise WHILE she was spraying off the driveway. She also said she stopped what she was doing and walked to the backyard and she heard a loud humming noise but no more bees than usual.

Well I noticed yesterday that one hive had a lot more activity going on than the other one. Today I looked at it again and there was still more activity at one hive VS the other. I decided to open up the less active hive to see what was going on. I tried to find the queen that I had marked with a big red dot but was unable to locate her. There also seemed like there was a lot less bees. I inspected the frames and I did see some brood that was not capped but I didn't see any eggs. I also didn't see any queen cells in between the frames but I may have some at the bottom of the frames??? It is my understanding if you loose a queen they will make one in the middle of a frame. But I also remember reading that before she swarm that she may lay a queen on the bottom. I may have a queen cell on the bottom frames?? I do not knoe why she would of swarmed. She had plenty of room and I think she was a first year queen?? I am going to give it a few more days and give it a good inspection. I will probably do it this Monday and see if I see a queen or new brood/eggs.