I had a sudden swelling of my veins beneath and to the left of my knee on the left leg. I was uncomfortable and the veins became pronounced, throbbing,and hot. I went to an urgent care and they sent me to a hospital for a D-dimmer test. It came back negative, showing no clotting. By the time I was home, a bruise began developing that is now 4 inches and really ugly. The dr. office called and said the tests were negative, but I don't know what might be wrong. Do I need to be careful until I can get to my Primary Health Dr. on Monday? Thanks, Alison