If you usually have regular periods, and usually have your period on time, and you are having sex, and you are not using contraception, generally speaking, if your period is delayed by 1 day, more than 90% of pregnancy can be detected. Therefore, it is advisable to buy an early pregnancy test and take a test to see if you are pregnant. Generally speaking, it is measured with morning urine, which contains a relatively high concentration of HCG. If you are pregnant, it is usually easier to detect. The safest and most accurate way is to go to the hospital and have a blood test. If it is not convenient to go to the hospital, you can buy an early pregnancy test paper and take a look.