I m 73yrs old, in good health. Female. This morning I hit my right leg , outside calf area with the bottom corner of the car door, when I was opening it. I normally have a high tolerance for pain, but this made me say ouch, and thought I probably would get a bruise from the hit. A few hours later I developed a pain , about the size of a half dollar, directly in the middle, back side of the right calf. It was extremely painful to walk. It s been over 8 hrs and the calf pain is still there, but not as intense. Could this be a blood clot??