There is nothing more nerve-wracking than the few minutes you wait for an at-home pregnancy test result to appear. Therefore, as far as how soon after sex you would be able to tell you were pregnant would probably be 10 to 14 days. However, you still may not get an accurate answer after that amount of time. Even in that timeframe, there still could be a falsely negative result, since hormone levels in early pregnancy can vary and the reliability of a home test depends on detecting a certain level of hormone, explains Dr. In most cases, however, with the sensitivity of modern urine pregnancy tests, blood tests are generally not necessary for pregnancy detection.

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After sex, if an egg has been fertilized it will travel into the uterus and implant itself in the wall. Once implanted in the uterine wall, the pregnancy hormone will begin to appear in your urine. If you think you might be pregnant, you'll want to know for sure as soon as possible. But it's important not to rush out and take a test immediately as it probably won't give you the right answer. This hormone is what the pregnancy test is looking out for - and it doesn't just appear overnight after having sex, it takes up to six days after fertilization for it to appear. You can take most pregnancy tests on the first day of your missed period. Some very sensitive tests can be taken before your missed period - as early as eight days after conception. However, if you are testing early you should be aware that your result could be incorrect. This is because levels of hormones vary from woman to woman and you may not yet be producing enough to be detected by a test.
When you can do a pregnancy test
Think you might be pregnant? Here's everything you need to know about taking a pregnancy test. If you think you might be pregnant, you'll want to find out for sure as soon as you possibly can. But it's important not to rush out and take a test immediately after having sex as it probably won't give you the right answer. We've pulled together all the information you need to know about taking a pregnancy test from the NHS. But remember, if you have any concerns it's always best to speak to your GP or visit your local sexual health clinic. After sex, if an egg has been fertilised it will travel into the uterus and implant itself in the wall. This hormone is what the pregnancy test is looking out for - and it doesn't just appear overnight after having sex, it takes up to six days after fertilisation for it to appear. Some very sensitive tests can be taken before your missed period - as early as eight days after conception.
If you buy something through a link on this page, we may earn a small commission. How this works. After all, it takes just one sperm to fertilize the egg. The hormone is only released if a fertilized egg attaches outside the uterus or to your uterine lining. Shop for pregnancy tests online. There are different ways to collect your urine for the test. Depending on the test you choose, you may have to:.