Hi! I plan on buying the Medela Harmony hand pump because I read it is a good one for occasional pumping. I am just getting over an oversupply issue and I don't know how to pump to build a supply without bringing my oversupply situation back. Also, I don't even know where begin. Do I pump immediately after she nurses? When and how often should I pump to build up a little supply? She is currently nursing only on one breast per feeding every 2-3 hrs. Thanks in advance!