Pumping while at work

Today is my first day back at work and I have been EBF my daughter since birth. I rarely pumped as I do not like it, but now I have to.

I just noticed that my right breast towards the armpit is very hard and tender to touch.

Is this milk my pump hasn’t extracted? I’m trying to massage it out cause I don’t want it to turn into a clogged duct or something worse. Since it’s already hard and tender is that bad?

I’m pumping every 2 hours for 15 mins with a Spectra S2.

Any advise for a newly pumping working mom? 😰