The menstrual period has been delayed for a week and a line on the test paper indicates that it is negative. In this case, consider: First, you can go to the hospital to have a blood test for human chorionic gonadotropin. A blood test is more accurate than the early pregnancy test paper, and sometimes, the early pregnancy test paper can have a false negative. Secondly, if you are not pregnant, you can do a gynecological ultrasound to see how thick the endometrium is, project when you will have your period, and if necessary, you can use medicine to promote the menstruation. Thirdly, we can do a female hormone level check, which may be caused by endocrine disorder. Fourth, it may also be affected by mental factors, such as stressful work and study, excessive mental tension, rest, poor sleep caused by the delayed menstruation.