Today, 11:50 AM
ok well full breasts do send the signal to make less milk. Again, assuming frequent nursing the rest of the time, this may be fine for overall milk production. But if you find yourself feeling full or uncomfortable and cannot pump more at work, or to just to be on the safe side, maybe you can add a couple of quick breaks to hand express as needed. http://www.llli.org/docs/0000000000000001WAB/WAB_Tear_sheet_Toolkit/06_hand_expression.pdf
There are pumping in the workplace laws out there, including the need to provide adequate break time. Have you researched this? They do not apply in ever situation, but you can also discuss with your employer the need to pump more often anyway. A lactating mother who is not removing milk from her breasts with adequate frequency is at a high risk of several issues, including mastitis which can be a very serious illness.
I assume you plan to pump some while at home anyway, as it is unlikely you can pump enough in one session to feed baby for 12 hours.
What happened with on older child breastfeeding-wise is not a clear indicator of what may happen this time, unfortunately. Not only is every baby different, our bodies may change with each baby as well.