13 days late for period some nausea breast tenderness headaches increased clear vaginal discharge increased urination negative at home pregnancy test.

Pregnancy unlikely. If you did the test correctly at 13 days after a missed period and the test was negative, you are not pregnant. You may see your doctor for an evaluation and if needed a blood test. See this site for information on this topic. http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/Pages/causes.aspx.