SOS— 1st Clogged Duct!

Help! I am a new mom and this is my first time breastfeeding...and I think I have my first clogged duct. I have a wicked oversupply of milk bc I had to pump in the hospital for my preemie. I’ve dropped pumping to 3 times a day, and feed baby in demand, but tonight I felt really engorged and a painful area one side. Once I started pumping the one side hurt and there is a really hard area in that breast. I’ve massaged and used heat, but not sure what else I can do to relieve the clog if that’s what it is? I don’t want to get mastitis!