I checked my hive again yesterday. I wasn't extremely thorough as the weather was looking a little spotty (didn't want to get caught with an open hive in the rain again), but I at least got the chance to check several frames for eggs and larvae. I saw capped brood, but no eggs or larvae. So I'm really starting to think that my hive is queenless.
I think I'll leave it alone for a couple of weeks....hopefully by then a new queen will have hatched, mated and be laying eggs. I think I'll feel better once I see eggs and larvae again.
Also, I've been having some trouble with my hive frames, specifically I'm trying to improve my hive handling technique.
Currently my biggest problem is that the frames have these spacers on them that I'm having trouble with. By spacers I mean these lengths of wood about the size of a pencil. There are two on either end of the frame running from the top of the frame to the bottom. They are just there to make sure you can't take two frames and press them flush against each other (which would of course squish the bees).
The problem I run into is that when I am closing up the hive I have to of course put all of the frames back in. I can only fit all 10 frames in there if the frames are snugly in there (where the spacer for one frame is resting right up against the spacer on the next frame, which is of course the point of a spacer), and I've noticed that sometimes I'll be pushing two frames together and I'll hear this unpleasant ---Crunch-- sound as a bee gets caught between the spacers.
I try to move the frames together slowly, but it seems like the bees don't get the hint and move. Instead they just sit there until they are trapped between the two spacers. According to the advice on bee source if you smoke the bees or blow on them as you slowly press the frames together the bees will scamper out of the way. I'm going to try very hard the next time I open the hive to not squish any bees in the hive.
Maybe this is how my hive ended up queenless in the first place.