In reality, home pregnancy tests have a detection limit for hCG, and if the levels in your urine exceed that limit, you may get a false negative. In other words, if you're pregnant with twins or triplets, you can obtain a negative pregnancy test because your pregnancy hormones are too strong to detect with a regular HPT. Women who use birth control pills or IUDs are at greater risk of having a negative test because they produce more hCG than women who don't have these methods of contraception. It's important to remember that a negative pregnancy test does not mean that you aren't pregnant. Many factors can cause a negative test even though you are indeed pregnant. The most common reason for a negative test is a low level of hCG in your blood or urine. If this happens early in your pregnancy, there is no need to worry about it being evidence that you are not pregnant. It may be evidence that your baby has not taken up residence yet in the uterus. A second reason for a negative test is if you have a hormone-producing tumor of the ovary or pituitary gland. These tumors can release large amounts of hCG into the blood which will also cause a negative test. A third reason for a negative test is if you have liver disease or cancer. If you have cancer and it has spread to the liver, antibodies from the cancer cells can cause a negative test result. A fourth reason for a negative test is if you have polycystic ovarian syndrome (PCOS).