If you have been nursing for few months, then the decrease of pumping probably is because of stress, dehydrate, not eating well etc as your supply should have steady for some time. But, if you have started for few weeks, your supply probably not steady yet and the best is to nurse and pump after nursing. If nursing is really unbearable, like I do, i will increase the pumping session by every 2 hours. you will see the increase in supply. But, also, the effectiveness of the pump is very important too. I used Medala Swing before, it's not very good compared to Medala Pump in Style Advance. But, this investment is really dependent if you are occassionlly pumping or not. I am full time working mom. I use my pump for two babies and helped me to provide breastmilk until they are 1 year old.