Under normal circumstances, pregnancy can be detected if menstruation is delayed for more than 7 days. If the menstrual cycle is relatively regular, occasionally delayed 3 to 7 days is a normal physiological phenomenon, if more than 7 days, and ovulation with normal sexual intercourse, this case to consider the possibility of pregnancy, you can use the early pregnancy test paper test, generally can be detected. If the menstrual cycle is irregular, this situation if the use of pregnancy test paper, the general test results may be inaccurate, because the menstrual cycle is not regular, ovulation will also be irregular, this situation if pregnancy using pregnancy test paper detection may be biased, then it is recommended to go to the hospital to test the concentration of blood HCG accuracy rate is higher. If your period does not come for more than seven days, it is recommended to go to the hospital in time to check whether you are pregnant.