Is a negative home pregnancy test accurate 36 days after unprotected sex?

Neg test = not preg: Home pregnancy tests are very accurate. They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. The best time to take one is when you miss your period. If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection. See your doc for irregular periods.