I used to work answering phones for a pharmaceutical company that manufactured pregnancy tests. The answer is no. All urine pregnancy tests look for the level of hcg, which is the pregnancy hormone. When a woman is pregnant the hcg in the urine starts to be detectable as early as the first day of your missed period. Hcg is what the tests detect and what gives you the positive. Depending on the test each test looks for a different level of this hormone. Semen, antibiotics, vitamines, ect... Have no effect on the test.
