You can usually use a pregnancy test when your period is 7 to 10 days late to determine if you are pregnant. The pregnancy test is a relatively simple and commonly used method to determine whether you are pregnant by the level of hcg in your urine. It is best to choose the right time for the test, as failure to choose the right time may result in inaccurate testing or other abnormalities, so be sure to take the test some time after the postponement of menstruation for the test results to be relatively accurate. It is best to choose the morning urine for pregnancy test, if the pregnancy test shows two lines, it means that pregnancy has occurred, and if not, it is not pregnant.