Looking for input - breastfeeding related

So my nursing is 16 months old! And we have had a pretty easy breastfeeding journey so far. I’ve never even had any discomfort really! Maybe once or twice! But over the last week every time we nurse my breast ache when she feeds. It’s not unbearable or anything but it is very sore! I have no red spots and I don’t think I have any clogged ducts because it’s both sides. What do you ladies think could be causing my discomfort... thanks in advance