Why Maybe False Negative.
phoenixfire76 posted:
Home Pregnancy TestsHuman Chorionic Gonadotropin (hCG) pregnancy tests or home pregnancy tests determine pregnancy through the detection of the hormone Human Chorionic Gonadotropin (hCG) in a woman's urine. Doctors recommend that you wait until you have missed a period to take a home pregnancy test. If you can not wait that long to find out and you know the day you may have conceived, then the earliest you can take a test would be 14 days from possible conception. Home tests are usually 97% accurate when all instructions are followed correctly and the results are read on time. Some kits come with two tests so that in case you have made a mistake, you may take the home pregnancy tests gain. Learn more about the accuracy of home pregnancy tests in another relevant article.
False Negative hCG Pregnancy Tests And What Causes ThemIf you take a home pregnancy test too early, you may get a false negative result. A false negative result is when the test says you are not pregnant but you are. This can be misleading and when using home pregnancy tests you must be very careful of avoiding any factors that may cause false results.
The major reason for a false negative test is that you took the test too early. Pregnancy tests vary in their sensitivity which means how soon they can detect the hormone Human Chorionic Gonadotropin (hCG) in your urine. It is possible that although your ovum might be fertilized, meaning you may be pregnant, but your body has not started secreting enough Human Chorionic Gonadotropin (hCG) for the test to measure. Your body needs time for the hormone to rise to a high enough level to be detected in a test.
If the home pregnancy test shows negative results but you still think you could be pregnant, wait a few days and try again. A negative result can mean that you are not pregnant, you took the test too early or you took the test wrong. Also, if you have received different answers on multiple pregnancy tests, it is recommended that you get a blood test done to get an accurate answer.

For most pregnant women the urine pregnancy test does not detect enough hCG until 1-2 days before missing the period. And in 1 of 4 pregnant women the home urine pregnancy test does not become positive until after they miss their period. Most false negative pregnancy tests occur when testing is done too early. You are pregnant but you test negative because there is not enough of the pregnancy hormone hCG in your body and especially your urine to be detected.
Check your chances of being pregnant or not with a negative pregnancy test HERE.
Quantitative blood tests and the most sensitive urine tests usually detect hCG shortly after implantation, which can occur anywhere from 6 to 12 days after ovulation. Beta hCG levels rise exponentially in the first two months or so of pregnancy so the earlier the test is performed, the higher the chance of a false negative result. Less sensitive urine tests and qualitative blood tests may not detect pregnancy until three or four days after implantation. Menstruation occurs on average 14 days after ovulation, so the likelihood of a false negative is low once a menstrual period is late.
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blueidmom3 responded:
I took a pregnancy test at the Dr. office before I started Devo-Provera and it came out negative. Four weeks later I tested positive with a HPT. When I got an ultrasound to determine the correct gestational age of the fetus, it was 11 weeks. Meaning I was already 6 weeks along when the professional pregnancy test "lied" to me.
shellhart03 replied to blueidmom3's response:
the test at the Dr. office... was it a urine or blood test? Just wondering.
Congrats on the baby! I hope you are having a wonderful pregnancy!!!
sagegoodenough responded:
i've taken 3 HPT's and all came out negative, but i feel pregnant, my belly is growing, and i'm feeling fetal movement (not like gas or digestion, i have two other kids as well) i'm also on mirena and have heard other people with mirena in who have gotten pregnant have had false negatives with HPT's and it took a blood test to prove they were, i look about 3-5 months along right now.