A pregnancy test can be used after 14 days of intercourse. Women who have regular periods and have intercourse during ovulation, that leads to a high probability of pregnancy. To find out if you are pregnant, you can use a pregnancy test or pregnancy stick after 14 days of intercourse, and a positive test means pregnancy. There are many ways to test for pregnancy. About 10 days after the last intercourse, you can take a blood test to check the HCG level in your blood to determine if you are pregnant. Early pregnancy test paper or pregnancy test sticks are used to check for changes in HCG (human chorionic gonadotropin) values in the urine, which is usually detected with morning, mid-day urine. Preparation for pregnancy and 3 months after pregnancy, you can take oral folic acid, which has the effect of preventing fetal cardiovascular malformation. If there is any discomfort, you need to go to the obstetrics and gynecology department of the hospital in time for examination.