Sore breast, clogged duct?

Casey
So I am breast feeding and only pumping twice a day to get enough to cover one night feeding. My left breast has gotten so sore today. It's also red under the areola and tender. Could I have clogged ducts? Just seemed to happen today. I've continued to pump and breast feed alternating which side I feed from. Any other suggestions for what this may be or how to make it feel better?