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    When to Take a Pregnancy Test (Don't Take it Too Early!)

    If you don't know when you ovulated, the earliest you should take a pregnancy test is two days before your period is due.

    When to Take a Pregnancy Test (Don’t Take it Too Early!)

    By Lindsay Meisel | Published Aug 16, 2016 | Last updated Jan 13, 2020 ✓ Fact checked

    Medically reviewed by Rachel Liberto, RN on August 15, 2019

    If you’re trying to get pregnant, you’ve probably experienced the agony of wondering whether you should take a pregnancy test. Especially when you’re experiencing potential early signs of pregnancy like nausea, headaches, and fatigue, it can be hard to resist testing early. Do you really need to wait until the first day of your missed period, or can you test earlier?

    How long should I wait before taking a pregnancy test?

    Pregnancy tests only work when the pregnancy hormone human chorionic gonadotropin (hCG) has built up in your system. This usually happens around 11 – 12 days after ovulation. Most women get their period around 14 days after ovulation.

    If you don’t know when you ovulated, you can approximate this window by taking a pregnancy test two days before your period is due.

    Keep in mind that if you test before your period is due, you may get only a very faint line on the pregnancy test.

    How long after ovulation can I take a pregnancy test?

    So you’re an expert at tracking your ovulation? You may be able to take a pregnancy test earlier. But if you take it before 8 days past ovulation (DPO), you are likely to get a negative test—even if you are truly pregnant.

    The reason why has to do with when implantation occurs. While it’s technically possible for implantation to occur any time between six and 12 days after ovulation, 85 percent of the time it occurs between eight and  10 DPO, and it only occurs at 6DPO 0.5% of the time. (Our implantation calculator post can help you estimate when it might have occurred for you.)

    Even if conception has occurred, the fertilized egg does not start producing hCG—the hormone that pregnancy tests detect—until after implantation is complete. (And speaking of implantation … read our post on the truth about implantation bleeding.)

    After implantation, hCG levels start doubling roughly every 48 hours. Baseline hCG levels, early pregnancy hCG levels, and hCG doubling time vary from woman to woman and from pregnancy to pregnancy. Along with the date of implantation, these factors will influence how early you can get a positive pregnancy test.

    Deciding when to take a pregnancy test is a risk-benefit calculation: testing earlier than 12 DPO means weighing the risk of being disappointed about a possibly false result against the unlikely outcome of an early positive.

    How likely is it to get a false negative pregnancy test?

    Most home pregnancy tests are highly accurate if you wait until the first day of your missed period to take it. If you’re testing earlier, your chances of a false negative result are higher. The reasons why you might get a false negative include:

    Testing too early. Do not test earlier than 12 – 14 days after ovulation. If you don’t know when you ovulated, wait until the day your period is due.Testing too late. If you test after the first few weeks of pregnancy, something called the hook effect can create a false negative pregnancy test.Testing at the wrong time of day. Test on first morning urine, when the concentration of hCG (the pregnancy hormone) are highest.Testing on diluted urine. If you drink a large amount of liquid shortly before testing, your urine volume may increase so much that hCG is too dilute to measure (this is more of an issue in early pregnancy, when your hCG levels are still relatively low).Using a test that is not sensitive enough. If you are testing early, you need to use a more sensitive test (learn more about the best pregnancy tests).Not testing urine immediately. If the urine collected has been sitting around for too long before testing—usually 30 minutes or more—a false negative result can occur.

    Why am I having pregnancy symptoms but a negative test?

    There are two possible explanations for this: if your period is late but you have a negative pregnancy test, it most likely means that you ovulated later than usual. The second explanation is that you’re taking the test too early, before implantation has occurred.

    Should you take a pregnancy test in the morning or night?

    If you’re testing before your period is due, it’s best to take a pregnancy test in the morning, when the concentration of hCG in your urine is highest. If your period is due or late, your hCG levels are likely high enough that you can test any time of day and still get a positive result if you are pregnant.

    What are the chances of a false positive pregnancy test?

    Truly false positive pregnancy tests are rare. The risk of a false negative pregnancy test is much higher than the risk of a false positive. Below are some possible explanations for false positive pregnancy tests (or, as you’ll see, what just seems to be a positive test but actually is not):

    Evap or indent line. Waiting longer to read the results than specified in the test instructions can lead to what appears to be a positive pregnancy test, but is actually a result of ink pooling in the body of the test.

    Source : www.avawomen.com

    How early can home pregnancy tests show positive results?

    Many home pregnancy tests are advanced enough to detect pregnancy several days before a missed period. Robyn Horsager-Boehrer, M.D., discusses what women need to know before choosing a home pregnancy test.


    How early can home pregnancy tests show positive results?

    June 28, 2022

    Your Pregnancy Matters

    Robyn Horsager-Boehrer, M.D.

    Obstetrics and Gynecology

    Home pregnancy tests can be very accurate if used properly.

    Since the earliest recorded history, women have had a strong desire to know whether they are pregnant as early as possible. The body goes through countless changes in the first trimester, and one of the first indicators is a change in the hormones that leave the body through urine.

    Ancient Egyptians relied on a form of urine testing to determine pregnancy status way back in 1350 BCE. A woman urinated daily on wheat or barley seeds and if the plants grew, it meant she was pregnant. Modern-day validation suggests that test was about 70% accurate in detecting human chorionic gonadotropin (hCG), a hormone produced by a woman’s body soon after implantation of a fertilized egg inside the uterus.

    Thankfully, urine-based pregnancy tests have evolved substantially. Women now have access to advanced tests that can detect a pregnancy as early as eight days after ovulation. But while many home pregnancy tests are marketed as simple and effective, getting accurate results comes down to how early in your ovulation cycle you take the test.

    Ovulation generally occurs around day 15 of a 28-day cycle. In a normal pregnancy, an egg is fertilized in the fallopian tube and then travels into the uterus, where it implants in the uterine wall. After implantation, production of hCG starts from cells in the developing placenta (tissue that will feed the fetus). Trace levels of hCG can be detected as early as eight days after ovulation.

    That means you could get positive results several days before you expect your period to start. However, the first part of your cycle is more variable than the second, making it tricky to determine the best time for an early test.

    “Thankfully, pregnancy tests have evolved substantially since the 20th century. Women now have access to advanced tests that can detect a pregnancy as early as eight days after ovulation.”

    When to take a home pregnancy test

    The length of time from the first day of a period to ovulation can vary by several days from month to month. Sexual activity around ovulation leads to the possibility of fertilization of an released egg by sperm. But even then, the time frame for a fertilized egg to implant can vary. And hCG isn’t produced until after implantation has occurred.

    For the most accurate results, we recommend testing in the morning on the day you expect your period to start. This allows for variability in the timing of ovulation, fertilization, and implantation. Testing in the morning provides a more concentrated urine sample.

    Follow the directions carefully to get the best results. Before you take the test, make sure you understand what the readout for “pregnant” and “not pregnant” will be. Some tests still use two lines to indicate you are pregnant and one to indicate that you aren’t. However, many tests have switched to words such as “yes” and “no”, or “pregnant” and “not pregnant” for additional clarity.

    Related reading: Is it OK to use a hot tub during early pregnancy?

    Pregnancy test accuracy

    Each type of pregnancy test is designed to detect a set minimum level of hCG. This is why pregnancy test manufacturers advertise the way they do: “Know four days sooner,” or “Accurate up to six days before a missed period.” However, while home pregnancy tests are quite accurate – many boast a 99% detection rate based on laboratory testing results – marketing claims can be misleading.

    For example, a 99% detection rate means a test can detect hCG 99% of the time on the day you miss your period. These statistics also assume that women are testing at the optimal time and following all instructions correctly.

    Many home pregnancy tests available today are midstream urine dip tests, which are the traditional “pee-on-a-stick” tests and are fairly easy to use. There also are tests in which you pee into a cup and dip a test strip into the urine. The New York Times published a story ranking the best home pregnancy tests, citing a midstream test with an ergonomic grip as the easiest to use and most accurate.

    Research has shown that average test results when women used the dip tests matched lab test results just 70% of the time, whereas 99% of women typically can get an accurate reading from a midstream test.

    False positive and negative results

    When a test result is inaccurate, it’s either a false negative (the test says you are not pregnant, but you are) or a false positive (the test says you are pregnant, but you aren’t). Several factors can cause false negative results:

    Having too dilute urine after drinking a lot of water or testing later in the day.

    Testing too soon when there has not been enough time for a fertilized egg to implant and start hCG production.

    Using a pregnancy test that doesn’t detect lower levels of hCG. You can check the package insert for more information about the level at which the test will be positive.

    Sometimes an egg will implant briefly but will not be sustained. This is also called a chemical pregnancy – hCG is produced, but the pregnancy doesn’t continue. A test performed several days before an expected period can show a positive result, but the woman still gets her period soon or on time. Rarely, certain tumors can produce hCG, causing a pregnancy test to be positive even when a woman is not pregnant.

    Source : utswmed.org

    How long after ovulation can you take a pregnancy test?

    In this post, we're explaining the "two week wait" between ovulation and the optimal time to take a pregnancy test.

    How long after ovulation can you take a pregnancy test?

    May 05, 2022 5 min read

    If you've decided you’re ready to start or grow your family, you may be eagerly anticipating the moment you hold a pregnancy test in your hands and see those lines indicating a positive result. But getting to that point takes some time.

    To get the most accurate reading on a home pregnancy test (and avoid a false negative result) it’s recommended to wait two weeks after ovulation before testing. That’s because these tests are designed to detect human chorionic gonadotropin (hCG) in your urine — and your body doesn’t start producing hCG until the fertilized egg attaches to the uterine wall. This is called implantation, and it takes about two-ish weeks after fertilization.

    In this article, we’ll break down the science and history of pregnancy tests and what you need to know in order to get the most accurate results when using them.

    Here are the most important takeaways:

    Home pregnancy tests work by detecting the level of hCG in your urine. Early in pregnancy, levels of hCG rise rapidly after a fertilized egg implants into the wall of the uterus.

    The “two week wait” refers to the two weeks between ovulation and when your hCG levels are likely high enough to produce a positive result on a pregnancy test. If you test too early, you might get a negative result, even if you are pregnant.

    It’s important to follow the testing instructions on your home pregnancy test to ensure the most accurate results.

    A quick refresher on the science of pregnancy tests

    The most surefire way to confirm a pregnancy is through a blood test or ultrasound done at a doctor’s office. But before visiting the clinic, at-home pregnancy tests can give you answers with about 99% accuracy (when you follow the instructions correctly).

    How exactly do these tiny sticks detect a pregnancy? It has everything to do with the level of hCG in your urine.

    Here's what you need to know about hCG:

    When a fertilized egg implants into the uterine lining, the body starts ramping up production of hCG — increasing by roughly 50% every day during the early stages of pregnancy — in order to nourish the developing embryo.

    Urine-based pregnancy tests compare the levels of hCG in your urine to a predetermined hCG threshold that indicates pregnancy.

    For a positive result, urine generally needs to have about 20 mIU/mL of hCG. Urine that contains anything less than 5 mIU/mL of hCG will show as negative.

    How long do you have to wait after ovulation before taking a pregnancy test?

    The instructions of most home pregnancy tests recommend waiting until the first day of a missed period since that's when you’ll get the most accurate results. If you’re tracking your cycle, this means waiting around two weeks (based on a "textbook" 28-day cycle) from the time of ovulation before taking a pregnancy test.

    For those who want results as soon as possible, some pregnancy tests (like the Modern Fertility Pregnancy Test!) are designed to detect a pregnancy as early as six days before your missed period — though results will become more accurate the closer you are to your missed period.

    Tracking ovulation and luteinizing hormone (LH) can help you determine exactly when to test for pregnancy — especially if you have irregular cycles. And if you're using the free Modern Fertility App, you'll get personalized recommendations for the best times to test for pregnancy each cycle.

    What happens if you take a pregnancy test too early?

    Remember that hCG levels increase rapidly after implantation, which is when a fertilized egg attaches to the uterine lining. Completed implantation is a slow process that can take up to two weeks. If you’re pregnant, but try to test before implantation happens, your hCG levels will still be too low to produce a positive result.

    Can anything else impact your pregnancy test results?

    One of the biggest factors that impact results from a pregnancy test is not following the testing instructions. An estimated 30% of people have trouble following a pregnancy test’s instructions,  which can lead to false readings. But, when used correctly, pregnancy tests will rarely produce an inaccurate result.

    That said, there are a few situations where the body will produce high levels of hCG that mimic the levels in early pregnancy and cause a false positive result:

    During some fertility treatments, like egg retrieval and IVF, injectable gonadotropins will increase the production of hCG. In most cases, your body will usually be clear of the excess hormones a few weeks after the injection.

    Certain tumors in the reproductive system, even benign ones, can cause hCG levels to rise.

    A chemical pregnancy or recent miscarriage will elevate hCG levels because implantation occurred. If you get a positive result, then retest a few days later and get a negative one, it’s possible that you’ve experienced a very early pregnancy loss.

    Have we always had to wait two weeks to test for pregnancy?

    Source : modernfertility.com

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