On the other hand, if you aren’t pregnant but the test says you are, then the result is a “false positive.”įalse negatives are more common than false positives. This is referred to as a “false negative.” However, it is also possible for the test to say you’re not pregnant when you actually are.
This can rightfully make you think that you’re not pregnant. This often means that the test didn’t detect a larger amount of hCG in your urine and that the results are “negative.” Sometimes, you can follow the directions on your pregnancy test kit to a T and not see any changes to the display. If you head to your primary healthcare provider or obstetrics/gynecology provider for testing, you would likely be given a blood test to check hCG levels. If you are not pregnant, then you may not see any changes on the display, a negative sign, or “not pregnant.”.
#A false negative pregnancy test may result from plus#
This strip contains antibodies that react with hCG and produce a change in color if higher-than-normal levels are detected.ĭepending on the test that you use, you may see a second vertical line (which can show up as a very faint line!), a plus sign, or the words “pregnant” on the display. However, nearly all of them will ask you to place a drop of urine on a designated strip. Home pregnancy tests are different in how they accomplish this. After this happens, hCG levels double nearly every 48 hours and peak in the first trimester. Your body begins to ramp up its hCG production shortly after a fertilized egg implants itself into the uterus.ĭepending on the person, this can begin 6-12 days after conception. While everyone has hCG in small amounts, levels of hCG increase during pregnancy to help grow the uterus and prepare it for pregnancy and childbirth.Ī positive pregnancy test detects a higher concentration of hCG. How Do Pregnancy Tests Work?Īn at-home pregnancy test works by measuring levels of a specific hormone in your urine called human chorionic gonadotropin (hCG). This guide from explains how pregnancy tests work, what causes them to show a false negative result, and how a twin pregnancy can contribute to this.
Some reasons for a false negative are more easily identifiable, like taking a test in early pregnancy when the hormones used to detect pregnancy aren’t very high just yet.īut did you know that a twin pregnancy can be another reason your test comes out negative? A false negative pregnancy test happens when your pregnancy test says you’re not pregnant - even though you are.
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