I've been expressing at work for the past few weeks, supply has been up and down but usually manage to get between 10 and 16 oz through the day. But today has been a real struggle - pump idn't seem to be working, tried hand expressing but milk EVERYWHERE. Eventually managed to get about 6 oz in 3 sessions . Any ideas? Not helped by the fact that have been using first aid room and people nearly walked in on me twice .