I've been exclusively pumping for almost two weeks now. My son, who is 7 weeks old, was breast feeding before that but we were having too many issues so I felt it was best to just switch to pumping only (hard decision!). A few days after starting to only pump, my nipples and breasts (mostly my nipples) became really sore and tender. My nipples also appear to have a whiteish color. It looks almost like I just have dry skin but I'm not sure. Should I be worried that my nipples and breasts are so sore and tender? Is this normal for moms who have started exclusively pumping?