Is There Such a Thing as a False Postive Pregnancy Test?

Updated on August 18, 2008
J.T. asks from Trinidad, CO
4 answers

Hi everyone,
Does anyone no if there is such a thing as a false postive or a false negative result for pregnancy test? For the last two or three months I have told my husband I thought I was pregnant.I have been off bc since march. We would go buy a test and take it, the result was negative. But my body says otherwise. In late June, we were on vaccation and I was really nautious most of the time, my mother suggested I was pregnant so once again we went out and bought a test this time the results were postive. All these months I have still had a regular monthly cycle just without cramping. During my last pregnancy the same thing happened with the tests. I do have a dr appt set up but I couldn't get in till the end of the month and I am kept up wondering about it. Thank you for any advice.

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So What Happened?

Thank you all for the responses. Today was the big day at the doctors. The conclusion is sad to say. I am not currently pregnant. The doctor said that it could have been the result of my body adjusting to not being on bc anymore. She also said that I also could have had a chemical pregnancy. So back to trying. Wish me luck:)

More Answers



answers from Los Angeles on

Rely on how your body feels. I could tell when I was pregnant because I felt different. A blood test is more reliable than the urine test, but if you're this far into it (sounds like you are 2-3 months along from your comments above), the urine test should be accurate. Start taking those prenatal vitamins if you haven't already :-) .

You may not have a false positive, but it's possible that you can have a positive pregnancy test but the pregnancy doesn't stick.



answers from Las Vegas on

I was told that you can have a preg test give you a false negative but not a false positive. In other words if your test comes back positive then you are definitely pregnant.



answers from Los Angeles on

Hi J.,you have not said what type of BCM you used and if you have had your periods after you came off?....however
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. A false positive pregnancy test is when the test says that you are pregnant but actually you are not. This is a one off case and a positive pregnancy test is a pretty good indication that you are pregnant. False positive pregnancy tests are rare - though there are instances and conditions where they can occur. There could be various reasons for a false positive test:
1-Chemical Pregnancy
A chemical pregnancy is basically an early miscarriage. Research has shown that half of all first pregnancies end in miscarriage. Due to the high sensitivity of home pregnancy tests, many women catch early pregnancies but end up going on to have their periods due to a chemical pregnancy.
2-Missed Reaction Time
For accuracy in home pregnancy tests it is essential that you read the test results in the stipulated reaction time. If you let the test sit for too long (after the instructions on the box tell you), the test is invalid. This may cause it to show false positive results.
3-Chemical Interference
Drugs that have the pregnancy hormone Human Chorionic Gonadotropin (hCG) in them can cause incorrect results in home pregnancy tests. The Human Chorionic Gonadotropin (hCG) in them may be responsible for the false positive pregnancy test. If you have had an HCG shot due to infertilty treatments, you need to be sure the shot is out of your system before you attempt to use early pregnancy tests.
4-Evaporation Lines
While technically not a true pregnancy, some pregnancy tests leave a faint evaporation line as the urine crosses the test. This faint very light grey evaporation line in the test area is often interpretted as a positive result.A blood test administered by your doctor is more sensitive than the early home tests and can be taken between seven and twelve days after you conceive.If you have the feeling of being pregnant and your test is pos then just wait until you see your DR and start your prenatal vit with folic acid....good luck.....keep us posted with the good news.



answers from San Diego on

The doctors told me you could never have a false positive. You can have a false negative if you haven't produced enough of the hormone for the test to detect it.

Congratulations! Hope you get your girl!

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