-Ectopic pregnancy: An ectopic pregnancy occurs when a fertilized egg implants outside of the uterus, such as in the fallopian tubes. This can cause a positive pregnancy test, but the levels of hCG will not rise as quickly as they would in a normal pregnancy.
- Recent miscarriage: If a woman has recently had a miscarriage, the levels of hCG in her body may still be elevated, which can cause a negative pregnancy test.
- Certain medications: Some medications, such as methotrexate and levothyroxine, can interfere with pregnancy tests and cause a negative result.
- Medical conditions: Certain medical conditions, such as polycystic ovary syndrome (PCOS) and thyroid disorders, can affect the levels of hCG in the body and cause a negative pregnancy test.
- Operator error: If a pregnancy test is not performed correctly, it may give a false negative result. Make sure to follow the test instructions carefully.