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Hormonal Birth Control (such as the pill) does not affect the accuracy of blood or urine pregnancy tests. Pregnancy tests measure a hormone (hCG) only present in pregnancy.

To ensure the best results: * Take the test in the morning, if possible, because your hCG (pregnancy hormone) levels are at it's highest * Don't drink a bunch of fluids before taking the test because it will dilute your urine and can affect the results * Take the test no more than 1 day before expected period. Although some test say that you can see results up to 5 days before your missed period, the percentage of accuracy is very low. * urinate for as long as possible on the foam-like strip * Check the results in the window frame of time suggested by the instructions of the pregnancy test

While it depends upon the sensitivity of the specific test, most home urine pregnancy tests (sensitive to 25 mIU) will turn positive about 13-16 days after conception. If you were not on oral contraceptives, this would mean about the time of the first missed menses. When you are on oral contraceptives, ovulation could have occurred at more irregular times so that all you can say is if the pregnancy test is negative, you are either not pregnant or are less than about 14 days pregnant from ovulation.

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12y ago

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