I've worried about DVT on many occasions and have got so worked up about it that I went to A&E, the doctor had a poke about and then did a blood test and said everything was fine and the pain was muscular. I felt so stupid after because there were people in A&E with me that had real illnesses and I was there with a pulled muscle!
Some blood tests can tests for clots. (D Dimer is what they're called)
Why did you get the blood test?
If your leg starts to swell or turn blue then go A&E but otherwise relax at home and try and take your mind off it.