Last week, I returned back to work and I was able to pump a lot of milks between 3oz & more each breast per pumping session (3 pumping session each day). Yesterday and today is my day off and I'm currently nursing my girl. Yesterday, I was able to pumped 3oz. This morning at 4am, I pumped my left milk and it only pumped .05 oz and my right breast pumped 1oz. I was shocked and usually pumped 5oz on both breast every early morning. I am wondering what's happening and is my milk starts to get low?