Getting my pump

Lindsey • Phlebotomist and X-ray tech by day, wife and mom of 2 by night. One girl and one boy makes our life complete!
My pump should be here tomorrow!! Question: if I start pumping along with continued nursing, am I going to deplete my milk supply? How many of you ladies do both? And how old was your LO when you started pumping? Mine will be 10 days tomorrow.