Usually pregnancy can be detected after 7~10 days after coitus, and the commonly used checking methods are early pregnancy test strips, blood HCG test, ultrasound and so on. 1. Early pregnancy test strips: the simplest and most convenient way, pregnancy can be detected 7~10 days after intercourse, urine specimen is the best morning urine, may also be due to the short time of intercourse and false negative situation, so the best time to test for 2 weeks after intercourse, retesting the next day if necessary. 2. Blood HCG: the most accurate test, usually earlier than the pregnancy test, such as the result of more than the reference range that suggests pregnancy, specific should also be combined with ultrasound to determine whether the pregnancy is normal. 3. Ultrasound: the timing of finding pregnancy is a little later, after 35 days of menopause or blood HCG more than 2000IU/L to detect the gestational sac in the uterine cavity. Once menstruation is delayed, it is necessary to consider whether there is a possibility of pregnancy, if found pregnant, should be hospitalized as soon as possible.