Are the breaks paid or unpaid?
The "Break Time for Nursing Mothers" law does not require pumping breaks to be paid. However, if your employer already offers paid breaks and you use those breaks to pump your milk, your time should be paid in the usual way. If you need extra time beyond what is usually allowed for these paid breaks, then the additional time does not need to be paid and your employer might ask you to "punch out" for the additional time.
For example, if your employer normally allows employees to take a 15 minute break, but you need 25 minutes to pump your milk, then 15 minutes should be paid and the other 10 minutes can be unpaid.
If you continue to work during your pumping breaks, you should be paid in the usual way.