Have a couple pumping / gear questions.

Past week or two my pumping has been a little weird. I feel like it's not "sucking" as well??? Like when my letdown happens the milk still comes out like it does pre-letdown? Yet overall I'm still getting the same amount.

I wonder if I have a clogged duct?
Or perhaps maybe there's a pinhole in the tubing of my pump? How do I check that??

Thennn today my left boob was hurting but I didn't think it should be engorged?! I feel like last couple days my pump has not been emptying my boob due to aforementioned issue. So that could have been it. And M actually slept from 930-330 so it was a bunch less nursing sessions.
And the weird part is it was hurting in lumpy portions only on the bottom half of my boob. So my first thought was mastitis??

But if it is it would still hurt after pumping right? I pumped 30minutes earlier than I usually do and now it feels fine.

Sorry, I know it's a bunch of questions!

Thoughts??