Test strips can detect early pregnancy 10-14 days after menstruation is delayed. For women who have regular periods and have unprotected sex during ovulation, the likelihood of pregnancy is high. Early pregnancy test strips can detect pregnancy after 10-14 days of delayed menstruation, and are usually more accurate in catching morning and mid-day urine. Meanwhile, after 16 days after intercourse, you can also use a pregnancy test stick or early pregnancy test paper to confirm whether you are pregnant. If necessary, 10 days after sex, through the blood test body HCG value, to determine whether the pregnancy, usually more accurate blood test. After diagnosis of pregnancy, you should go to the obstetrics department of the hospital in time for examination and timely treatment such as birth control.