I started trying to pump at about 1 week postpartum with my Medela Pump in Style and was only able to get a few drops at first. I have trying it every day and now I can get 1.5 oz at one time. Is this normal? Each time I pump I get a little more, but I am worried by the time my DS is 8 weeks I won't be able to pump enough for his caregivers while I am at work. Does being able to pump a lot take time or should I be concerned?