The accuracy of the pregnancy test is related to the time of the test, which is generally accurate, but false negatives cannot be ruled out. Many women who are worried about pregnancy after delayed menstruation will buy early pregnancy test strips in pharmacies on their own. Generally, if the menstruation is regular, you can test whether you are pregnant with early pregnancy test strips about 7 to 10 days after your menstruation is pushed back, preferably with morning urine, and if it is negative, you can test again in two or three days, because sometimes it is not always possible to detect pregnancy in time because the menopause is short, but if the menopause is long and you are pregnant, it is possible to detect pregnancy with or without morning urine. If the menopause is long and you are already pregnant, you can test whether you are pregnant or not with morning urine. For some women who have irregular periods, sometimes a negative urine test does not mean that they are not pregnant, so it is recommended to have a blood test for human chorionic gonadotropin (HCG), which is more accurate than a urine pregnancy test. For women with delayed periods or those who take the emergency contraceptive pill but have delayed periods, they should be alerted to the possibility of pregnancy. It is also important to be alert to the possibility of pregnancy if the period is on time but the volume of the period is significantly reduced or the period is prolonged, as this irregular vaginal bleeding is likely to be caused by a preterm miscarriage or ectopic pregnancy. In conclusion, the pregnancy test result is accurate, but if it is negative, it cannot completely exclude the possibility of not being pregnant, and a blood test for HCG is more accurate.