If you do not get pregnant after 13 days of intercourse with an early pregnancy test, the result is more accurate and usually means that you are not pregnant. Most people are able to detect pregnancy after 10 days of intercourse, especially during ovulation. This is because the fertilized egg will settle and secrete a small amount of chorionic gonadotropin about 1 week after intercourse, and the pregnancy can be detected in the serum 10 days after fertilization. A blood test is more accurate than an early pregnancy test, which is usually more accurate with morning urine. You can use the morning urine every morning to monitor for a deepening of the test and if it deepens, pregnancy is confirmed. If ultrasound is done, it is best to see the gestational sac only after 1 week of delayed menstruation, as ultrasound done too early may not be able to see the gestational sac due to late embryo implantation or delayed ovulation.