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False Positive Pregnancy Test

on Aug 23, 2012

by Alyssia Granger

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False Positive Pregnancy Test

Did you get a positive pregnancy test and then start your period? Find out the reasons behind a false positive pregnancy test.

A false positive pregnancy test, where a pregnancy test that says you are pregnant when you are actually not, can be a discouraging roadblock on the path to getting pregnant. Today we are going to talk about false positive pregnancy tests and why they happen. First, let’s start off by saying that false positive pregnancy tests are rare, but they do happen. When all instructions are followed completely and a home pregnancy test is used properly, they are usually between 97% and 99% accurate. They usually work, and they usually work well. But, this is not to say that false positives do not occur. Here are a few of the reasons why a false positive home pregnancy test might occur. Claim Your 20 Free Pregnancy Tests – Click Here

Reason #1: Evaporation line

This is by far the number one cause of a false positive pregnancy test at home. Some women do not read the directions fully, or do not follow them exactly. It is important to not only read and understand the directions, but to also follow them. There are a ton of at-home pregnancy tests on the market, and each one is slightly different from the other. What is considered proper procedure for one test may not be proper procedure for another. This is why you have to make sure to follow the directions when taking an at home pregnancy test. Studies say one of the most common forms of misusing home pregnancy tests is digging them out of the trash, or checking them again after more than five minutes have elapsed. After that much time, the test is void and you must retest, as an evaporation line may appear that will appear like a second line. Never go by the results on the test after the specified amount of time is up.

Reason #2: Early miscarriage

What many women do not realize is that a so-called ‘false positive’ is really not a false positive at all, but rather a genuine positive pregnancy test. But as all women are likely to do, you test again the next day or the day after or the day after, and the test is negative. If you go to the doctor, the blood test results will show negative too. But what about the positive test? It could have been a very early miscarriage, or chemical pregnancy, in that you did get pregnant but lost the pregnancy so early it was even before a missed period. The most common cause of an early miscarriage is a genetic defect, that ‘corrected’ itself by not continuing forward with the pregnancy. These types of miscarriages occur about 15% of the time, and if you hadn’t tested early, you would have just seen your period begin and never even know about it. Because today’s pregnancy tests can detect the HcG hormone sooner than even a missed period, they can detect a pregnancy as soon as it happens.

Reason #3: Medication interference

This is also a common reason for false positive pregnancy tests. Sometimes medications can interfere with the results of a home pregnancy test. Phenothiazine is one medication that can cause a false positive result, but many other medications have the ability to interfere with a home test especially those that contain hCG like Pregnyl and Profasi. Sometimes blood in the urine or protein in the urine can also cause an inaccurate result.

Reason #4: Defective or expired tests

This is a more rare reason for a false positive test, but it does happen. Always check the date of your test and make sure it is not expired. If it is expired, don’t chance it, just get another test. There are also defective tests out there, although they are few and far between. There is much speculation that more women experience ‘false positives’ when using the types of tests that show results as + or -, as opposed to 2 lines. So be sure to keep this in mind.

As you can see, false positive home pregnancy tests are pretty rare, but they can and do happen. You can test at home all you want, but just remember: Your doctor is the only one who can tell you for sure.

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False Positive Pregnancy Test, 4.7 out of 5 based on 3 ratings

Alyssia is mom to 2 giggley twin girls, Sophia and Emma, and son Hunter. She's a Southern girl, passionate about photography, travel and her husband Josh.

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  • shay

    Okay so I had unprotected sex at the first of the month 3 times and my period isn’t here yet. I took two tests and I took them apart to see if there was a line and I could only see a faint positive line after I took it out. Could it just be an evaporation line? What should I do? I’m only 17 years old and I need to know asap!

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  • LoosingIt

    I had a positive pregnancy test result. But just the day after I took the test I started bleeding. I went to the docs and they said to go back in a week to do blood test. I am freaking out. Did I lose the baby?

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  • Jus jaszii

    HI I took a pregnancy test on Sunday and it came out postive with the first response. On the 29th I started bleeding, and it isn’t like my normal period its kinda light compared to my periods. But now my hpt are negative and also my blood. Did I get a false postie?

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  • Amy Elizabeth Wood

    Please tell me how often a false positive comes from the conciveeasy test.. I took three of the blue ones that came positive and a pink that’s neg. I almost fainted when j seen those positives but am now reading that a lot of peoe have gotten false positives from the test in the kit.

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  • Camilla

    Hi, I’m very confused I ovulated on the 3rd of this month (August) tested negative on pregnancy test on 13th and got what I assumed was my period late that evening then bleeding stopped 18th. 19th did ovulation test that came back positive so did a pregnancy test, both faint positive then did a digital test that came back negative, had a bit of spotting and this morning (20th) took another test and got another faint positive but fainter than yesterday? Have GP appointment but not for over a week ????many thanks x

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  • Marissa

    Hi, I’m 21 and just did three home tests within 2 days. All three were positive, including one test from the doctors. so the doctor got bloods done. Within the one day I waited for the blood results to get back, I started bleeding? The blood test came back negative?? I only bled for three days which is unusual for me on my period. I don’t know if this all means I’m not pregnant because of the negative blood test and the bleeding, or if it means I am pregnant because of the three positive urine tests????

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  • Sashika

    I took a pregnancy test this morning and got a strong positive. These days I have sore throat therefore I am using tablets zinnat, famo d 20 and vemetis. Can these medicines indicate a false pregnancy?

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  • Kimberly

    I took 2 pregnancy test and they both was positive and now I’m hurting and bleeding lightly. What is going on?

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  • Never happened before

    Question Please:I am 35 & on birth control- No antibiotics taken, Never missed a pill but took 7 hours later on two occasions. Was suppose to start menstrual on Sun and Started Tuesday then stopped Wednesday completely. No Spotting. Cycle always runs atleast for 5-7 days. Took 3 Pregnancy Test all were negative. Last one was Sunday. Still Cramping as if I am on my cycle, really bad. I am wondering if you have any suggestions? I will be buying another test because this has never happened before. Thank You.

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  • Darlene Rodriguez

    I started my period like normal on sept 28th. Im still bleeding 4 weeks later. I took a pregnancy test twice and both came back positive. I went to the dr they did an ultra sound and blood work im waiting for results but now stress due to waiting. Could I be having a miscarriage?

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  • kelcey

    Hi! So I have been on the conceive easy pills for 28 days now last Friday I took a pregnancy test it came back positive. So I figured it was because of the pills. I waited and Monday I took 2 more both came back positive. Wednesday I went to the er and theirs said negative. I took 2 more today and they came back positive. Could I be? Or is it because of the pills?

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  • Sara

    Hello my Daughter is 18 and with a USA Marine. He had came in for 3 weeks to visit and they where trying for a child. It was still early when we did the first test at the family doctors office then a few days later she did a home test and was very bright positive then the next day we go back to the family Dr and her test was negative again? They did blood work on her so I’m praying I get the grandchild Ive been wanting. Plz send many prayers our way for My daughter and her Marine fiance have the dreams they want to come true thank u so much praying tomorrow the blood test says she is going to be a mommy and a daddy.

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  • Katie Cadigan

    I used a pregnancy test and it said I was pregnant. But I never missed my period, it’s supposed to happen the end of this week to the beginning of next. Could the pregnancy test be wrong?

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  • tonya

    I have to first say my husband got fixed 2 years ago and. No i have never cheated. I am 4 days late and took 1 test this morning and got a + then took 2 more to be sure and got both -’s on them. A few hours later i started spotting but have now stopped and i have cramps really bad.

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  • Britt

    I’ve had 3 positive pregnancy tests this past week. As of this morning my period was 4 days late but now I am bleeding as though my period is here??

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  • Bianca

    hello I had sex with my bf for 3 years with out any pregnancy success we had intercourse with out protection before we broke up. 2 weeks after the breakup started dating a friend with whom i had intercourse friend he used a condom it got stuck and we changed it for a new one . now i have a positive pregnancy test can it be possible to be pregnant from this guy although we used a condom ?

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  • Arielle

    I am 20 I took 2 pregnancy tests today, and they both said positive, and I’m now bleeding. Not a lot but not just sporting either.

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  • KV

    i’ve taken 4 home tests in the last 2 weeks (2 different brands) all positive …my last period was in november…i’ve been very nauseous…but other than that i don’t feel different and this is my 2nd pregnancy…could i not be really pregnant…i dotn go to the dr for another 3 weeks…

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  • Yaya

    I took the plan b pill 2 hours later of having sex. Then i took 2 pregnancy test 2 and 3 days before my period was going to come i took them and csme positive. The day my period was suppose to come IT CAME BUT REALLY heavy..

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  • Sarah Guevremont

    I had a period in december, then I missed January and February. I took a test about a week ago and it came up positive. I spotted about 2 days ago, but it stopped after a few hours. This morning when I woke up I was bleeding like a light period. Now in the evening, I’m getting a slight pinching pain. I’m also rh negative. Is this a period or am I in the beginning stages of a miscarriage? Is there any way that my hormones from being pregnant the first time cause missed periods and a positive test?

    P.S I have a healthy 5 month old girl, going to be 6 months on March the 7th. I had her on labor day! (September 7th 2015)

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  • gladis

    7 days late on my period and I started bleeding I’ve taken 5 home pregnancy test all of them have been positive don’t know what this means.

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  • Felicia Veronica Bondad

    Hi. I took a test yesterday afternoon and the result was positive although the testing line is 40% lighter compared to the control line. After that, I experienced cramping that lasted less than a minute. So I thought maybe it’s false positive, then I took one test again using the morning urine and same result faint positive. Then this morning, I peed and wiped there was a brown discharge (sorry TMI) so I though AF is coming but it didn’t. I am still experiencing period-like cramps as if AF is about to come. I’m confused, is it really possible to have false positive twice??

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  • Amaja

    I took a pregnancy it was positive butcthr hospital say negative am I pregnant or not

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  • TJ

    I am getting repeated home tests that are coming up positive (early pregnancy tests). Twice I had a doctor give me a test, neither doctor was willing to blood test. Both doctor urine Hcg were negative. Should I go with my husband’s and my gut, and continue until a doc does give a blood test or just consider the multiple home tests all to have been false.

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  • jadin

    Hello, my period was a week late as of this morning, I took a test at 6:40am and the second line was very faint but as soon as I got to work I started bleeding like I started my period, no super heavy but more then spotting.

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  • Tania

    Did you end up pregnant ? I’m going through the same!

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  • Ashley Cowling

    I had a mc may 8th. I bled for almost 2 weeks. Then i bled again june 20th it was brown discharge and clots the first couple days. On monday july25th i went to the doctor because i been cramping for what seems like since my last period . i tested and tested and always got false pregnancy test. I was told i had a ruptured cyst and a cyst on on right ovary. I have been having cramps on my left side. Lately its been in the middle and i have been sick. On July 26th the next day i took another test that was negative with still no period and its now the 30th i feel horrible. I still havent had a period and im really sick. The test is positive. Could it be a false positive?

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  • Skylerann

    I just took a pregnancy test at home as soon as i was done peeing on it the lines started to show up as soon as i set it down both lines were showing does this mean im pregnant i have missed my period and my boobs have been hurting for a month now

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  • Roxana Sacre

    Hey, I took plan b last month in August and clearly now I have not gotten my period for atleast a month. I took a pregnancy test and it came out positive with a faint line and shaded line. I’m kind of worried because I feel like I’m in danger of miscarriage. I don’t feel pregnant or anything at all and mostly women have a implantation bleeding I didn’t even get that. I’m pretty worried. Should I be concerned?

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  • erika

    Hello I’m here cuz on September 19 I confirmed.a pregnancy and September 21 started bleeding went to hospital and told I was not pregnant. It’s October 25 and I just did at home pregnancy test after taking the plan b because I’m a.week late on my period and got a positive result
    Any intake on what this could mean

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  • Erika Chapa

    So on September 19 I confirmed a pregnancy three home pregnancy test and a blood work lab order. On September 21 I started bleeding and headed to hospital there they told me I was not pregnant. I had unprotected sex at the beginning of October took a plan b it’s October 25 . And 7 days late on my period with a positive pregnancy test . Could I be pregnant or is it a also positive

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  • Evelyn

    Hello, i took plan b about 2 weeks ago .i took it a day after me and my boyfriend had sex . I took 4 pregnancy test and im freaking out!

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