I just got my pump today. I got the Avent Isis manual pump. I noticed that some people said that they had very little suction when they started using it. My problem is just the opposite. Well, it's not that there was too much suction, it's just that the suction wasn't just on my areola. I noticed that part of my areola (and not just the nipple) was being sucked into the little tube area. It sucked in only one side of the area, and it was swollen and sore when I was done. Now it hurts pretty bad and I'm afraid to pump again because I don't want the other side to hurt. Any ideas on what I did wrong?