In very early pregnancy, it is possible but not common that drinking a lot of water during the day and testing in the afternoon or evening could affect the accuracy of the test. When urine is diluted, it can be harder for some pregnancy tests to determine whether hCG is present.
However, research suggests that highly sensitive pregnancy tests should stand the challenge of diluted urine. To be safe, test earlier in the morning to avoid any confusion. If you get a negative pregnancy test after having previously had a positive test result, you may be having a miscarriage —especially if you are also having abdominal cramping and vaginal bleeding and if you notice the loss of any pregnancy symptoms such as fatigue, nausea, and sore breasts.
There is a chance that one of the issues above might be affecting the accuracy of your second pregnancy test if you are still in very early pregnancy. When in doubt, call your doctor's office for advice. If your period is late but your pregnancy test is negative, there are a number of possible explanations. Call your doctor if you believe that you are pregnant.
They may perform a blood test, which can detect not just the presence of hCG, but the amount. Get diet and wellness tips to help your kids stay healthy and happy.
Adams Hillard, PJ. Menstruation in adolescents: what's normal. Medscape J Med. The effect of physiological urine dilution on pregnancy test results in complicated early pregnancies. Br J Obstet Gynaecol. The amount of hCG in your body starts to increase once a fertilized egg implants in your uterus, and can be detected about 10 days after conception.
Where you are in your cycle also matters. If you take a pregnancy test before this time, you might get a negative result, even though you're actually pregnant. Your pregnancy test should come with instructions about how long you will need to wait between taking the test and checking your results — the wait time is usually about one to two minutes. This is because the antibodies in the test need time to sense the hCG in your urine and display a result.
If you check the test before the waiting time is up, you may see a negative result even if you're pregnant. To get an accurate positive result from a pregnancy test, you need to have a high concentration of hCG in your urine, which can be affected by several factors. If your pregnancy test is expired , it might give a false negative result. This is because the antibodies in the test that react to hCG hormones slowly evaporate over time — eventually there will be too few antibodies to accurately sense hCG.
You should always check the expiration date on a pregnancy test before using it to make sure you're getting an accurate result — they will often expire after a year or two on the shelf. Pregnancy tests may also be defective. However, this is more the exception than the norm since many tests come with a control indicator to prove that the pregnancy test is working properly. In the meantime, drink plenty of water as another dilution technique. Getting a false-negative pregnancy test because of the hook effect is rare.
False-negative test results can happen for many reasons. One older study that tested 27 different kinds of at-home pregnancy tests found that they gave false negatives almost 48 percent of the time. You might get a false-negative pregnancy test for other reasons. Or you may take a test too early. It takes time for the hCG hormone to appear in your urine. Make a follow-up appointment a few weeks later and ask for another test and an ultrasound scan.
If you have a molar pregnancy, you need urgent treatment and careful monitoring. You know your body best. Let the doc know that the tests might be wrong if you feel that you might be pregnant. Learn about potential problems associated with rheumatoid arthritis and pregnancy, including triggers, preeclampsia, premature birth, and low birth….
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A fetal arrhythmia is an irregular heart rate — too fast, too slow, or otherwise outside the norm. It's often benign. To get a positive pregnancy test, many factors have to come into play. Even when a woman is pregnant, she might not get a positive result. To get a positive test, a woman must: Use a sufficiently sensitive test. Test at the right time during her cycle. Test only after implantation. Have HCG levels that are rising. Correctly read the test, since even a faint positive is still a positive.
False positive pregnancy tests are very rare. Most women will never have one. In fact, false positives are so rare that if a woman does have a positive test and later has a negative test, she should assume she had a very early miscarriage. If you test positive, try testing again a day later. If that test is also positive, then the odds that you are not pregnant are nearly zero. Some reasons a woman might have a false positive include: Allowing a test to sit for too long.
This can cause an evaporation line that may look like a faint positive. Using an expired test. This can cause a positive line to appear even if the test is not positive. Having a chemical pregnancy. When this happens, the woman is pregnant, but has an early miscarriage. A recent miscarriage. HCG levels take a while to drop following a miscarriage. A woman who has recently had a miscarriage may still test positive on a pregnancy test.
Taking certain fertility medications. Talk to a doctor if you take fertility medications, since a home pregnancy test might be less accurate. If you have a positive pregnancy test, call your doctor since you are probably pregnant. Some women get a negative test, and then later test positive for pregnancy.
If this happens, believe the positive test. If one test is positive and one test is negative, the best option is to wait a few days. Then take a third test. If that test is positive, you are probably pregnant. If the test is negative, or you continue to get a mix of positive and negative pregnancy tests, it could mean you are having a miscarriage or that your HCG levels are very low.
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