If your period is delayed for 4 days, if you are pregnant, you can take a pregnancy test, or go to the hospital to get blood HCG to see if you are pregnant. Another situation is that if ovulation is delayed, menstruation is delayed for 4 days, if the pregnancy can not be detected, then we have to wait for a week to see if the menstruation is on time, if not have to take another pregnancy test. Another method can also be used, clinically pregnant two weeks after the pregnancy test, whether the pregnancy can be detected, can look at the time of the last coitus. If it has been more than two weeks, then the test paper if there is no pregnancy, basically can be ruled out, so there are two methods of pregnancy test.