I recently got a PIS and don't quite know what to expect. I started to use it, but only get like an ounce per session. I am breastfeeding full time as well. I have tried the morning, after a shower, drinking water, etc. I don't know if I am doing this correctly or not. I pump until there is nothing else coming out, then for a few more minutes. Should I be waiting longer. Is this normal to only get such a small amount. I am trying to build a stash as I will have to go back to work.