15 days late went to docs did pee test but negative. have had so many symptoms doc says the pee tests are normally accurate. could i still be pregnant?

Tests are accurate: Pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, vaginal spotting, or medications. A test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period. If tested earlier, such as less than 2 weeks after sex, a negative result might be due to testing too early.