Would you go to the er?

Lauren • Baby 3 is here!
I was standing in rehearsal for about 3 hours, and my foot started to hurt a little bit. Over the course of the next two hours my foot started to swell and the pain got a lot worse. I'm 23 weeks +2, and my doctor said to go to the er. Do people get blood clots in their feet? I thought it was a leg thing.