Could My Swollen And Painful Feet In The Third Trimester Be Due To Standing For Long Periods?

I am pregnant and Ive been having swelling in my feet since I entered my third trimester. I am 37 weeks and 6 days now, I’ve noticed that they’ve gotten more severe and are quite painful. I do stand for long periods of time so Im not sure if maybe that could be the issue? I’m just worried that it might be preeclampsia.