[barry42001]

Chances are excellant that if the bees are there then the queen is there as well, they are drawing out comb, and foraging--should have seen nectar and pollen collectinons. typically takes the new queen a week or so to start laying start being concerned in the third week if no brood present. also should allow the bees about those same 3 weeks before disturbing them--yeah know is tough not to want to check up on the girls, but wait as takes them several hours/ days to regroup from a major disruption like a though look over.
Barry

 

[barry42001]

As for seeing small larvae and eggs if you turn the frame upside down you can see them alot better
Barry

 

[barry42001]

If your not in a nectar flow then definately feed, if you are in a nectar flow not needed but can be helpful. With regards to the queens presence as stated if the bees are gathering pollen and nectar they are doing it for a reason--they are planning on rearing brood. As I stated previously, if you take a frame ( in about a week or so ), and turn the frame upside down, holding it up to the sunlight the cells angles will be right for sunlight to fully go down into the cell and you should be able to see eggs, and small larvae remember the life cycle for worker bees 21 days from egg to hatching--within 3 weeks you should be seeing all stages of brood even allowing the queen 2 weeks to start. And of course come back whether you need help or not we enjoy your company.
Barry