Blood in expressed milk.

[hscannon]

Has anyone experienced bleeding while pumping? I had to purchase a new AC adaptor for my Medela PISA several weeks ago and now my pump is super strong even on the lowest setting! It doesn't happen every day but I've had several episodes of bleeding while pumping. I don't have any visible nipple trauma, but pumping has been more painful since using the new power cord. Anyone ever have a similar problem? I breast fed my first child for 15 months and pumped at work three times a day for most of that time, and never experienced this issue. My son is now 5 months old and I've been pumping at work with him for the past 3 months.

Thanks in Advance!