“How long does it take for a girl to know she is pregnant?”

The accuracy of a pregnancy test is most closely related to the day of ovulation, not of the act of intercourse or insemination that caused the pregnancy. Most of the over-the-counter pregnancy tests can tell if someone is pregnant the week following a missed period. Home pregnancy tests are different and come with instructions that must be followed closely for the most accurate results. After testing, you can confirm results by seeing your health care provider.