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If you take a urine pregnancy test sooner than 10 days after conception, the tests might give a “false negative” result. If you take an early test and it's negative, you should continue to test if you miss a period. It's known as the "pregnancy hormone" because it's produced only when you are pregnant. If you have a 28-day menstrual cycle, you can usually detect hCG in your urine 12 to 15 days after ovulation. 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.
Brandi Jones MSN-Ed, RN-BC is a board-certified registered nurse who owns Brandi Jones LLC, where she writes health and wellness blogs, articles, and education. She lives with her husband and springer spaniel and enjoys camping and tapping into her creativity in her downtime. Qualitative point-of-care and over-the-counter urine hCG devices differentially detect the hCG variants of early pregnancy. When you invest in your health with us, 10% of the profits directly support female leaders who are empowering girls and women across the world. Join our community to learn about these inspirational women and their work.
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Your hCG levels will double every hours after implantation, and it is important to give those levels time to climb. Therefore, day 21—or 1 week before you expect your next period—is the approximate time when hCG would be secreted and could be detected by a urine pregnancy test. However, just because you peed on a stick and it was negative on day 21 doesn’t mean you aren’t pregnant. Hormonal pregnancy tests such as Primodos and Duogynon were used in the 1960s and 1970s in the UK and Germany.
The study did note that regulations for these tests are different in Europe than in the United States and that the results may also vary based on the user. To use an at-home OTC pregnancy test, you pee on the end of a stick, which will check your urine for hCG. If you take a urine pregnancy test at a healthcare provider's office, you will pee into a cup and your provider will dip a test stick into your urine sample.
Pregnancy test accuracy
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. The best time to take a pregnancy test is the day after your expected period and in the morning hours, with your first urine of the day. However, when you're anxious to see results, it's understandable if you are tempted to test earlier. Getting a negative pregnancy test result doesn't mean your urine doesn't contain the pregnancy hormone .
If the urine collected has been sitting around for too long before testing—usually 30 minutes or more—a false negative result can occur. Although you might be eager to take a pregnancy test as soon as possible, it’s best to wait until your period is a week late to get the most accurate result. If you can’t wait until your period, let at least one to two weeks pass after you have sex before taking a pregnancy test. In other words, the amount of HCG needed to be detected in the urine to produce a positive test result is lower in some tests.
Getting pregnant
An at-home ovulation predictor kit can help you track fertilization. If you recently did an IVF embryo transfer, you may be wondering when is the soonest you can take a pregnancy test. After the transfer of a 5-day embryo, it takes a few days for the embryo to snuggle in and attach to the endometrial lining. When this happens, a woman's body begins to produce the pregnancy hormone from cells in the developing placenta. Use First Response™ Early Result Pregnancy Test to tell you 6 days sooner than your missed period.
Which one is right for you may depend on factors like cost, result speed, and whether you prefer digital or paper tests. If you read the instructions carefully, most tests promise 99% accuracy on the day of your missed period—but not for early results. If you expect your period on Wednesday, Thursday would be the day of your missed period. Likewise, first morning urine may be more concentrated and detect hCG more accurately. "Early results" pregnancy tests promise results as soon as three to six days before your missed period. These tests are more sensitive than standard tests, but getting accurate results that early is more difficult simply because ovulation and implantation times can vary.
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If you ovulated a little late, you may have conceived later in your cycle. In this case, there may not be enough hCG for these tests to detect until closer to or after your missed period. Taking a pregnancy test first thing in the morning gives you a better chance of getting an accurate result. Assuming you have not been waking up to drink a lot of water through the night, your urine will be more concentrated right when you wake up. HCG levels should almost double every 48 hours at the beginning of pregnancy.
If you buy through links on this page, we may earn a small commission. Commissions we earn from partner links on this page do not affect our opinions or evaluations. Our editorial content is based on thorough research and guidance from the Forbes Health Advisory Board. Urine hCG concentrations are approximately one-half of, or less than one-half of, corresponding serum hCG concentrations. This means that you would have to have twice as much hCG in the urine as the blood test would show.
He now focuses his practice exclusively on gynecology and gynecologic surgery, staying current with the latest medical research and developments. He is experienced in indications including endometriosis, uterine fibroids, menopausal symptoms, vaginitis, sterilization and anemia. Dr. Whitfield is also an active principal investigator with a demonstrated history of working in the clinical research industry, focusing on women's health care. It is impossible to get your period while pregnant, but bleeding or spotting can sometimes occur in early pregnancy. Check with your doctor if you experience bleeding or spotting after receiving a positive pregnancy test result. A pregnancy test will read positive as early as a few days before you miss your period, but is most accurate if you wait until a day or two after you have missed your period.
Ultrasound is also a common tool for determining viability and location of a pregnancy. There is a multilevel urine pregnancy test that measures hCG levels semiquantitatively. This test has utility for determining the success of medication abortion. The beta hCG level is important for checking the growth of the embryo and is highly predictive of live birth.
For the best results, take the test after you think you’ve missed your period. Test during your first morning bathroom visit, or hold it for several hours to increase the concentration of the HCG hormone that the test measures. It’s common to experience light bleeding or spotting in the early weeks as the egg buries deeper into the uterine lining during implantation. Take note of any difference in the color, texture, or amount of blood. Another home pregnancy testing kit was based on the work of Judith Vaitukaitis and Glenn Braunstein, who developed a sensitive hCG assay at the National Institutes of Health. Tests are now so cheap that they can be mass-produced in a general publication and used for advertising.
Always check the test's expiration date and read the instructions carefully before you take the test. Follow the test instructions for how long to wait before checking results — usually two or more minutes. Most tests also have a control indicator — a line or symbol that appears in the result window. If the line or symbol doesn't appear, then the test isn't working properly. During early pregnancy, the HCG concentration increases rapidly — doubling every two to three days.
What level of beta hCG is a good number?
The best time to take a pregnancy test is a few days after your missed period and when you haven’t peed in many hours. If you take two pregnancy tests and both are negative but you still believe you may be pregnant, contact your healthcare professional. If you haven’t been tracking your cycles or have an irregular period, know that hCG levels typically become detectable within two weeks of conception. As such, wait about 14 days after you had sex to take a test.
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