Without contraception, pregnancy can be detected as early as 8-10 days after intercourse if intercourse occurs during ovulation. After the sperm-egg union, it takes about 1 week for the sperm to settle and start to secrete chorionic gonadotropin, but the amount of secretion is small at first and increases as the secretion increases. Usually, a woman can know if she is pregnant by measuring the blood hCG level around 10 days of pregnancy and by measuring the urine hCG level around 14 days of pregnancy. The presence of a gestational sac can be observed by ultrasound at around 40 days of pregnancy to rule out ectopic pregnancy. Women who choose to take a urine test can go to the pharmacy to buy early pregnancy test strips for self-testing. Morning urine is relatively more accurate, but still has a certain probability of false positives and is not as accurate as a blood test. In addition, it is important to note that you need to hold your urine before having an abdominal ultrasound. If necessary, you can choose vaginal ultrasound, which does not require holding urine and is more clearly viewed.