owie, owie, owie! I am so sorry! You know, I've read that Lactation consultants have gotten fooled when checking pump horn size because some women's nipples start out fitting the horns well but after 5 min or so of pumping get bigger, so big that they are too big for the horns despite what they looked like at the start of the pump session....just a thought. If your nipples are bleeding, something is not right....