I received the pump on a Thursday and have been using it for a min of 15 minutes a day I already see and feel the results. I am currently a 34 B I’ve been using it for 5 days and my loose fitting bra now feels tighter and I’m spilling out a little. My breast are already feeling heavier. The measures on the cup come in handy when I place my breast in the cup they start off at 6 and the suction almost makes my nipple touch the top of the cup. After use my breast swell to the point I have to take off my bra.