It may happen that a test strip that detects pregnancy is actually not pregnant. The test strip test for pregnancy measures whether human chorionic gonadotropin (HCG) is elevated in the urine or blood. Human chorionic gonadotropin is produced primarily by trophoblast cells, but germ cell tumors and malignant tumors (e.g., tumors of the lungs, adrenal glands, and liver) can also produce chorionic gonadotropin levels. Trophoblastic tumors, liver cancer, bowel cancer, and ovarian adenocarcinoma may also be measured positively with test strips. The chorionic gonadotropin-alpha chain is structurally identical to the luteinizing hormone-alpha chain, and when there is an increase in the production of the luteinizing hormone-alpha chain during ovulation, the test strips can be used to show that you are pregnant, when in fact, you are not. In addition, the quality of test strips is not qualified, test strips expired or not standardized use or read the results, etc. There are evil fights may appear false positive results. Test paper test whether pregnancy is not completely reliable, can be further to the hospital gynecology consultation, under the guidance of the doctor to further improve the examination to determine whether pregnancy.