You can test for pregnancy if your period is delayed for 7 days. Cessation of menstruation is the first presenting symptom of pregnancy, and with an early pregnancy test you can usually check for pregnancy after your period has been delayed for 7 days. Early pregnancy test strips are used to detect human chorionic gonadotropin in the urine and if it shows two bars, it means positive for pregnancy. You can also test for pregnancy about 16 days after your last intercourse by catching morning urine with an early pregnancy test or a pregnancy test stick. Ten to fifteen days after intercourse, determine whether you are pregnant by drawing blood to check the HCG value in your blood. In addition, for women with regular menstrual periods, you can go to the obstetrics and gynecology department of the hospital to do an ultrasound to check whether the pregnancy is intrauterine and observe the development of the gestational sacs around the 45th to 55th day of pregnancy.