Achy legs

cbubbles2

I was just wondering if this is a normal pregnancy symptom around 21 weeks or if it's just because of my crazy long days. I leave my house around 4:30-4:45 and I'm not usually home until 6-6:30.  Every afternoon my feet and  legs are so sore. It almost hurts to walk/get up.  Anyone else this achy? I feel like it's a bit early to be so tired and sore!