I took a test for STD 3 months and 2 weeks after exposure on 13th Jan considering 30th Sept as a the d day. The tests came as negative . What are my chances to get a positive test in next 3 month follow up test on March 30th ?. I am having pain in my joints ,upset stomach, constipation and fatigue since 1 month.What other tests are recommended.I am scared as most people say that tests after 3 months of exposure to STD ( specially HIV or HPV etc.) are not convincing. A retest after 6 months from the date of exposure is required. Also will the test results after 6 months be conclusive?.