Pregnancy tests can detect pregnancy as early as 1 week after menstruation or about 10-14 days after intercourse. Early pregnancy tests are used to determine pregnancy by detecting HCG in the urine, which is secreted by placental trophoblast cells, and the body begins to secrete this hormone 10-14 days after ovulation, with the level in the urine becoming apparent 1-2 weeks after pregnancy. For people with a 30-day menstrual cycle, it is easier to measure after 7 days of delayed menstruation or 10-14 days after intercourse. Some women have irregular menstruation, ovulation time is also uncertain, so the use of early pregnancy test paper time is uncertain, according to their menstrual cycle, in 7-10 days after menopause can be early pregnancy test. For those who are still negative after several tests, there is also a possibility of pregnancy, and it is recommended to review the test after a few days of delay. It is recommended to have sex without contraception to delay menstruation, with early pregnancy test paper test, you should go to the hospital again to draw blood HCG, to determine whether the pregnancy.