Pregnancy unlikely: Home 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 either missing a period or getting a "weird" period. If done sooner, a negative result may be due to testing too early.
Answered 3/29/2015
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