Can you walk too much during pregnancy?

Monica
I am 19 weeks pregnant and work 40+ hours a week in retail, not complaining lots off ppl do it. Recently I worked Friday Halloween took my boys trick or treating and worked the next Saturday. I took a nap after work and woke up in so much pain. My pack hips and feet hurt so bad. This has never happened and I have two children that I worked throughout both pregnancies.