Is the generic for Micronor = Errin Oral

My wife's is breast feeding our new born baby, 3 months old.  Her OBGYN prescribed Ortho Micronor for birth control, because he said it was safe for breast feeding.    We went to Sam's Club, and they gave her Errin oral medication.  They told her that it was the generic brand for Ortho Micronor and that it was the same thing.  .  I just read on this website that you should not take Errin if breast feeding.  So what is the story?   Did Sam's Club give us the wrong medicine?

Florida Father