If you were having a miscarriage could your pregnancy test come up negative the day before fetus was expelled?

A pregnancy test typically detects the presence of human chorionic gonadotropin (hCG), a hormone produced during pregnancy. The levels of hCG rise rapidly in early pregnancy and can be detected in urine and blood tests. However, the timing of when hCG levels decrease and become undetectable after a miscarriage can vary.

In some cases, a pregnancy test may come up negative the day before the fetus is expelled, while in other cases, it may still show a positive result. This variability is because the rate at which hCG levels decline after a miscarriage can differ from person to person and may be influenced by various factors such as the stage of pregnancy and the individual's metabolism.

Additionally, the sensitivity of pregnancy tests can also affect the results. Some tests are more sensitive and can detect lower levels of hCG compared to others. Therefore, it is possible for a highly sensitive test to detect hCG even after a miscarriage has occurred, while a less sensitive test may show a negative result.

For these reasons, it is essential to rely on other clinical indicators and a healthcare professional's evaluation to determine if a miscarriage has occurred or is impending. A definitive diagnosis may require additional tests, such as blood tests or an ultrasound examination.