I am a new mom of a 7 week old and am just starting to pump. I have a Medela pump in style and after a few minutes the milk starts to flow and then stops so I stop pumping. I get about a half ounce from each breast. Is this the wrong thing to do? The reason I stop is because my breasts start to ache shortly after I start pumping. I purchased the next size breast shield to see if that would help but that didn't do anything. My nipples do not touch anywhere in the shield. It is the areola that is really sore after pumping which makes me not want to do it all. Thoughts?