Probably not, but...: Pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, vaginal spotting, or medications. A blood test gives a reliable result 2 weeks after sex or after missing a period. If done sooner, a negative result may be due to testing too early, such as less than 2 weeks after sex. One can retest with a urine test 1-2 weeks after a blood test.
Answered 10/4/2016
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