At 28 weeks, breast pain is pretty common, but it can range from normal pregnancy stuff to something that needs checking out lah, a few of us mums had it and it was just hormones, but one of my friends had blocked ducts so she saw her gynae to be safe. Since you're asking if others had it at the same week, I think better you mention it to your doctor just to rule out anything, especially if it's one-sided or you notice lumps or redness lah.