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why do some pregnancy tests show negative

Wrong pregnancy test results do happen, and in fact false negatives are more common than false positives. However, it s also important to say that this shouldn t give you false hope. A negative pregnancy test is still most likely to mean you re not pregnant. But if you really believe you are pregnant and have , there s a chance you may be right. If you think you may be pregnant but the pregnancy test is negative, there may be several reasons, says our expert, midwife Nikki Khan. It's too early "Home pregnancy tests measure a specific hormone in the urine called human chorionic gonadotrophin (hCG), which is only present when a woman is pregnant," Nikki explains. "It's produced from the very early stages of pregnancy following egg fertilisation. "Some pregnancy tests are more sensitive than others to this hormone and claim to be able to detect several days before you miss your period. But they don't always detect hCG levels this early in pregnancy, especially if your levels are very low. For this reason, most brands suggest repeating the test in a few days. The opportunity to test for pregnancy earlier due to the increased sensitivity of today s tests, also increases the risk of testing before your hCG levels are high enough to detect. One mum, in our forum, explained how she got wrong pregnancy results.

I have had false negatives but only when I've tested before my AF [Aunty Flow eg my period] was due. The ones taken after have always been accurate. However it does all depend on when you've ovulated. had a similar experience. I had 3 false negative results, then 2 days later brought a Clearblue digital one and sure enough I was pregnant. I think I just tested too early. Read more: It s the wrong time of day "Be aware that the timing of the urine sample can have an effect. It's most accurate to test first thing in the morning - so always try to test yourself then, says Nikki. The best way to wee on your stick is with your very first urine of the day - your first morning urine (FMU as it s called). This is when the hCG will be most concentrated in your urine, and so easiest to detect. There are a number of conversations about FMU on our forum. One mum-to-be
who usually does a middle of the night wee, wanted to know which urine would be best to test. When I come to do a test with FMU, will the fact that I've already been to the loo a few hours earlier make a difference on the outcome of my test? Or should I be testing with my 4am pee? " Your wee is too diluted Don t drink lots of water or other liquids in the couple of hours before testing, as this will dilute your urine.

Try to hold on, for as long as is comfy, before weeing and pee straight on to the stick. Of course, there is a chance you re not pregnant "The test may have shown a negative result because you're not actually pregnant, explains Nikki. If you've missed your period and are experiencing pregnancy symptoms, but have a negative pregnancy test result, ask your GP for a blood test to check your hormone levels, which should help to clarify the situation. " Occasionally you may get a very faint line on your pregnancy test, which can be difficult to interpret. Read more: If you remain unsure about whether or not you are pregnant, always consult a health professional. I started testing from 3 days before period due with the pregnancy tests that claim they can detect hormone then. But nothing I didn t get a positive result until I was about a week late. I am irregular, but I decided to take a pregnancy test, well 4. All are either unclear or really faint. I am going to a doctor tomorrow. I took a pregnancy test today, however the result was quite weird. I dipped 2 tests into a jar of my urine. One came out negative, and the other had half of a faint line that showed up.

Read more If you re trying to get pregnant, there s good news: You may still be pregnant. Sometimes, levels of the pregnancy hormone early in pregnancy arenвt yet high enough for a home pregnancy test to detect. One found that only have to detect hCG levels above 25 milli-international units per milliliter (mIU/mL) to achieve the commonly advertised 99 percent accuracy rate. The writers of a calculated that to detect 95 percent of pregnancies, a test would have to detect levels as low as 12. 4 mIU/mL. But not all home pregnancy tests were consistently sensitive enough to do so. A woman s cycle can vary widely, so if you conceived later in your cycle, your hormone levels may not be high enough at the time of your missed period. There can be as much as a 13-day difference in when occurs, meaning that you may think you are 4 weeks pregnant when you re only two weeks along. Pregnancy bleeding, recent hormonal contraceptive use, or breastfeeding can all interfere with accurately knowing your dates, as well. If you think you may be pregnant after a missed period but got a negative result on your pregnancy test, wait a few days. Then retest. If you continue to miss your period, be sure to talk to your doctor to rule out any complications.

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