I have started to pump 3-4 times during the day about every 3 1/2 to 4 hours. I have a Medela PIS backpack style pump. After I am done pumping my nipples are very sore to the touch. Right now I am applying olive oil to the areola but not the nipple part, is that the right way to do It or should I apply it to the nipple too? I have turned done the suction on the pump. Any suggestions would be appreciated!!