
I know my body is used to my pumping times at work too, since if I'm late, I will letdown too!!
I would pump on one side while nursing on the other. It does take some coordinating, I pump handsfree with the rubberbands in a figure 8 (from kellymom.com) and that helps to pump while he's nursing. Doing that from when he was 1.5 months old (I went back to work at 3 months), I got 275 ounces in the freezer for my return to work. And since my body is used to the pump, I get to bring home between 12 and 16 ounces of milk for my 8 hr shift, pumping 3 times. He only dips into my freezer stash about every other day, the other days they get to use my freshly pumped milk for him.
To ensure my supply was as good as possible, I'm taking lots of herbs. But if it helps me meet my goal of not supp with formula, I'll do it. I take fenugreek (5 pills, sometimes 4) 3 x a day, blessed thistle (4 pills sometimes 3) 3 x a day, and Reglan once. I also bought a brand new PISA from Medela, my old PIS had been through 2 kids and was just about 5 yrs old. Make sure you are hydrated, and you are getting enough calories. Sometimes not eating enough will drop your supply.
Good luck!