My calf has been swollen for about 8 days now. The first 2 or 3 days I have pain, like an ache type of pain. A few days before this started I had been walking 1.5 miles every other day or so, so I'm thinking this has something to do with it. But I am also concerned about a blood clot. Should I see my doctor? I am 20 years old by the way.