Those look nice and healthy shrimp. I don't think there is much to worry about, or that you can do anyway at this stage. t\he shrimp have been through a lot of stress with shipping and getting used to different water so they may drop eggs, or the eggs maybe unfertilised and unviable, or they may be just a bit lose, or young/new mom as you say. The fact they are grey eggs (unless that is just because it is in the shade), I suspect they are fertilised and have used up the (yellow) yoke, but are fairly small! I think the shrimp at the top has yellow eggs as well.
When the shrimplets hatch they will be very small and clear so there is likely to be a period of a week or 2 before you will see the shrimplets.
Just enjoy keeping an eye on them for now, nice clear photo.