Are there any fish or snails in the tank?
With these types of shrimp you will first notice what's called a saddle. This is a red rili, just a color variation of RCS. The yellow cluster in the middle of the body is the saddle:
Not long after you should see the eggs under their tail. They're usually yellow but can also be green:
New moms often drop their first batch of eggs, that's normal. Keeping the tank stable is important. New shrimplets are very tiny and usually lack color.
Congrats on the shrimp!