There are not a lot of bees on those frames ... and whilst the drone cell pattern is pretty scattered and would, usually, indicate laying workers, I would expect to see some workers eggs (multiple eggs near the top of the cells - worker abdomens are not long enough to get to the bottom of the cell) and I can't see any eggs when zooming in to your photos.
With so few bees I'm still half thinking you have missed a swarm ... or two perhaps ?
There is also not a lot of stores on those frames - at present I'd like to see an arc of honey at the top of the frames and perhaps some pollen. It's got all the hallmarks of a weakened colony. Are there any dead bees on the floor or outside the hive ? Are there any stores elsewhere in the hive (outer frames/Super) ?
It's not looking good to me Sarah ... get yourself a swarm trap out - you only need a box of some sort with about 40 litres capacity and a small entrance - if you have a frame in your existing hive that has had brood on it but is not currently in use put that in your swarm trap - a drop of lemon grass oil if you have any will help.
Things happen in beekeeping - don't beat yourself up - positive thoughts and a fresh start beckons.