Have you got the results of your blood test back yet? Urine tests are very accurate for most people, but sometimes the hormone HCG that they detect is too low to be picked up and a blood test will check what that level is. Have you had children before, if not and you are not pregnant, I would ask your dr about the leaking breast again. Its not normal for someone to leak having never been pregnant before to my knowledge. Also if you have had a kid before, it is unfortunately very common to leak during your period, or even ovulation… Not fun, but normal.