Generally speaking, you can determine whether you are pregnant by the HCG test in urine or blood about 10 days after intercourse, and if the value is more than 25 IU/L, you can be sure that you are pregnant. Generally speaking, it is counted from the first day of the last menstrual period, and the HCG secretion will be doubled within 1 month after the formation of the embryo. A simple urine pregnancy test is usually a clear positive indication about 4 to 5 weeks after pregnancy. After this secretion of the embryonic trophectoderm and the growth and development of the embryo, there will be a significant change in the value of the HCG doubling in early pregnancy, usually at intervals of about 2 days, so for those who are pregnant, early pregnancy tests can be performed early. If a woman is newly pregnant and needs to go to the gynecology department for an ultrasound to confirm an intrauterine or ectopic pregnancy, the precaution is to hold urine before the abdominal ultrasound to keep the bladder full before the test. For vaginal ultrasound, there is no need to hold urine.