Pregnancy can be detected as early as about 1 week after intercourse and as late as no later than 2 weeks after intercourse. Most people will be able to test around 12 days after intercourse. For women who usually have regular menstrual cycles, ovulation is usually 14 days before the next menstrual period. If you want to increase your chances of conception, you can project the ovulation period, have intercourse during the ovulation period, and use early pregnancy test paper to detect whether you are pregnant a week afterwards. The early pregnancy test is valid for observation within 5 minutes and has an accuracy rate of about 75%. Morning urine contains higher levels of chorionic gonadotropin and it is best to test with morning urine. Although the early pregnancy test is convenient, there is a possibility of false positives or false negatives. If your period is delayed for more than 1 week, it is best to go to the hospital for blood hCG, ultrasound and other related tests to confirm whether you are pregnant.