Swelling in feet and ankles 28 weeks pregnant?

i am 28 weeks pregnant tomorrow. I have had swelling in my feet and ankles. My doctor says all my test and blood pressure have been very good! My gestational diabetes test came back normal. And i do not eat a lot of salty foods. my job though does require me to sit in front of a computer for 8 hours a day which i know can cause swelling so i do put my feet up whenever i can. Just wanted to know what other people have been doing to help with swelling! Thank you!!