Usually, a pregnancy test can check if you are pregnant when your period is delayed for 10 days or when you are about 4-5 weeks pregnant.
A pregnancy test is used to determine whether a woman is pregnant by detecting the level of HCG (human chorionic gonadotropin) in her urine, which is secreted in large quantities in the body only after the fertilized egg has implanted in the body, and is therefore usually detectable around 10 days after the menstrual period has been delayed or 4-5 weeks after the pregnancy has been conceived.
However, due to individual differences, the time of detection may vary slightly. It is recommended that women take the test in the morning, when the results are more accurate.
Before using a pregnancy test, women should avoid taking hormonal drugs, which may affect the results, and should go to the hospital for a checkup for further confirmation if the result shows pregnancy.