Trying this now (yes, got the nb cups on as I type - haha). I guess the size is okay as the pump sucked all my breast tissue into the cups (but is that okay or is it better to have the cups fit around your breast with no tissue on the outside prior to pumping?). Just wondering if this affects the shape at all? All I can picture are these tubular breasts which is how it looks under the cup! Also, not been good at getting good suction so far.. "farting" noises come out sometimes, but am getting better at it. I also notice it pumps my left (smaller) breast more than my right which is kind of interesting - anyone know why this might happen? I suspect it may be because the cup is too small for my right breast. I can feel a bit of breast tissue at the armpit sie that is no getting sucked in. I think I will try to exchange the cups 