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What Are Pregnancy Tests?
 In 6 to 12 days after conception, a woman may experience implantation bleeding. About 7 days after that, hormone levels in the urine are high enough to detect using a home pregnancy test. In general, take the test after you notice your menstrual period is late. Pregnancy tests are used to verify if a woman is pregnant. They work by checking urine or blood for a hormone called human chorionic gonadotropin (HCG) that the body produces when pregnancy occurs. This hormone is released when a fertilized egg attaches to the lining of the uterus, signaling the beginning of pregnancy. What Do Pregnancy Test Results Mean?If pregnancy test results are positive, it means a woman is pregnant. If they’re negative, it means a woman is not pregnant. When Can A Pregnancy Test Be Taken?Pregnancy tests may be taken any time after a woman’s menstrual period is late. A woman may also choose to test after implantation bleeding has occurred. Implantation bleeding is an early sign of pregnancy. It occurs when a 6 to 12-day-old fertilized egg attaches to the inner lining of the uterus, causing light vaginal bleeding or spotting. About one-third of women experience implantation bleeding, which is normal and typically happens near the time of a woman’s next expected menstrual period. About four to five days after implantation bleeding, HCG levels in the body reach detectable levels in the blood. For at-home urine pregnancy tests, it may take up to 7 days for HCG levels in the urine to reach detectable levels for testing. How Soon Will A Pregnancy Test Read Positive?While some pregnancy tests claim to work a few days before a missed period, the results are usually less accurate at that point. Some tests may be able to detect pregnancy hormones in urine as early as 10 days following unprotected sex, but the results are not very reliable, and women may get a false positive or false negative test result. For women who have irregular periods or who do not get periods at all, testing about 3 weeks after unprotected sex may yield more reliable results. If a test reads positive, a woman may want to check with her doctor for a blood pregnancy test to confirm the results. Most women who have a positive pregnancy test should wait a week or two before calling the doctor for a blood test. Why Might A Pregnancy Test Produce the Wrong Result?There are 2 types of inaccurate results:
There are several reasons for inaccurate results:
SLIDESHOWStages of Pregnancy: Week by Week See SlideshowReferences Medscape Medical Reference
What is implantation bleeding?Implantation bleeding is light vaginal bleeding that sometimes occurs very early in pregnancy. If you choose to test as soon as you discover spotting, be aware that the earlier you test, the more likely you are to get a false negative. If you notice spotting or light bleeding several days before your period is due, it could be implantation bleeding. Spotting has many causes, so you might wonder how to recognize implantation bleeding. Before you reach for a pregnancy test, see if your symptoms and the timing of your spotting line up. Implantation bleeding is light vaginal bleeding that sometimes occurs very early in pregnancy. Implantation bleeding can happen when a fertilized egg attaches, or implants, into the uterine wall. The egg attaches to the uterus anytime between 6 to 12 days after ovulation. This means if you ovulate on day 14 of your cycle, implantation could happen sometime between 17 to 26 days after the start of your last period. As the fertilized egg settles into the uterine wall, this can cause the lining to slough off and result in spotting or light bleeding. Bleeding can also occur due to changing hormones related to early pregnancy. Even though it's rare, if you have spotting a week before your period is due, you might wonder if it's implantation bleeding. Implantation bleeding can be a very early sign that you're pregnant. How common is spotting in early pregnancy?One small study showed less than one in ten women reported vaginal bleeding in early pregnancy. In most cases, the spotting occurred near the date their period was due. Spotting is even more common later in pregnancy. Up to 25% of women experience bleeding or spotting at some point during their pregnancy. Spotting during early pregnancy could mean many things, including:
Spotting in early pregnancy can also be due to implantation. How do I know if it's implantation bleeding?Timing can be vital in knowing if your spotting might be implantation bleeding. Implantation typically occurs 6 to 12 days after ovulation, so spotting that happens as a result of implantation should happen in that timeframe or soon after that. For most women, this means the spotting would take place a week or just a few days before their period is due to begin. Implantation bleeding can vary in appearance, but it's typically:
You might have other early pregnancy symptoms, like fatigue and breast tenderness, at the time of implantation bleeding. Early pregnancy symptoms might raise your suspicions that your vaginal bleeding is due to implantation, but unfortunately, many early pregnancy symptoms are similar to premenstrual symptoms. The best way to know if you're pregnant is to take a pregnancy test. When can I take a pregnancy test?Home pregnancy tests measure the human chorionic gonadotropin (hCG) in your urine to detect pregnancy. Your body begins to produce hCG as soon as implantation occurs. The earliest you might have enough hCG in your system to get a positive pregnancy test is about eight days after ovulation. However, many pregnant women will not get a positive pregnancy test result this early. The amount of hCG can vary due to many factors, including the timing of implantation. A week after ovulation, soon after implantation bleeding, hCG levels can be as low as 5 mUI/ML of hCG. At four weeks pregnant, at the time your period is due, your hCG levels can range from 10 to over 700 mUI/ML of hCG. Home pregnancy tests typically detect pregnancy at hCG levels greater than 20 mUI/ML. Wanting to take a pregnancy test as soon as you experience possible implantation bleeding is understandable. If you choose to test as soon as you discover spotting, be aware that the earlier you test, the more likely you are to get a false negative. A false negative can happen when pregnant, but your hCG levels are not yet high enough to trigger a positive result on a home pregnancy test. The best thing to do is wait a couple of days after seeing implantation spotting before taking a pregnancy test. This gives your body time to produce detectable levels of hCG. For the most accurate results, wait until your period is due before taking a home pregnancy test. QUESTIONThe first sign of pregnancy is most often: See AnswerMedically Reviewed on 1/12/2022 References SOURCES American Academy of Family Physicians: "Bleeding During Pregnancy – What's Normal?" Flo: "Period-Like Bleeding During Early Pregnancy: Is It Normal? Causes and Signs of Implantation Bleeding." Human Reproduction: "Vaginal bleeding in very early pregnancy." March of Dimes: "Bleeding and Spotting During Pregnancy." StatPearls: "Human Chorionic Gonadotropin." UCSF Health: "HCG blood test – quantitative." UT Southwestern Medical Center: "How early can home pregnancy tests show positive results?" Do you test positive before or after implantation?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.
How many days after implantation will I have a positive pregnancy test?If you are pregnant, your body needs time to develop detectable levels of HCG. This typically takes seven to 12 days after successful implantation of an egg. You may receive an inaccurate result if the test is taken too early in your cycle.
What are positive signs of implantation?What Are the Signs That Implantation Has Occurred? Implantation is an essential early stage in conception, when cells attaches to the uterine wall. Signs of implantation include bleeding, cramps, discharge, and breast tenderness, and these can be early signs of pregnancy.
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If you have a positive pregnancy test has implantation occurred
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