If the urine is diluted (due to dehydration) or the test is performed too soon, it might result in a false negative. Second, like with urine or home pregnancy tests, a blood pregnancy test can provide misleading findings (both negative and positive). This is because blood contains many different proteins that may cross-react with the antibody used in the test. Thus, a negative result does not rule out pregnancy. Only two more confirmatory tests can establish with certainty that you are not pregnant: an ultrasound or serum hCG level check. A negative pregnancy test does not mean that you cannot be pregnant. It may simply mean that the egg has not been released from your ovary yet. You will need to wait until you miss your period before trying again.