If you experience a combination of the signs and symptoms of pregnancy, you should take a home pregnancy test. While still not 100 percent accurate, home pregnancy testing can offer a relatively safe determination of whether or not you are pregnant if used properly. If the test comes back positive, or if you think you have made a mistake in reading or administering the test, you should immediately see a physician for pregnancy testing. He or she will conduct a blood test that is much more accurate than home pregnancy testing. This is the only definitive way to confirm conception. Later, a physician will be able to conduct a test to check for a fetal heartbeat. Only the presence of a fetal heartbeat is a definitive indicator of pregnancy.
How Soon Can I Take a Home Pregnancy Test?

Some at-home pregnancy tests are able to detect pregnancy as early as four days before a woman's expected period. However, these tests are not be accurate for all women.

Home pregnancy tests are designed to recognize the presence of a certain hormone that is produced only in women who are pregnant. Human chorionic gonadotropin, or hCG, is a hormone that is produced after the embryo implants itself in the uterus. This process can take place six to 14 days after conception. Even the most advanced home pregnancy tests cannot confirm pregnancy until embryo implantation occurs and hCGs are released. If conception occurs during the 14th day of the menstrual cycle and implantation does not occur until 14 days after conception, hCGs will not be present until the date of the woman's expected period.
False Positive Pregnancy Tests

A false positive result from a home pregnancy test can be the result of several factors. If you have taken any fertility drugs or received any fertility injections, you may not be able to use early home pregnancy testing, as it will most likely show a positive result even if you are not pregnant. Sometimes, evaporation lines-lines where the liquid has dried and left a mark-are incorrectly read as positive results. Another very common reason for a false positive result is not reading the pregnancy test in time; if the test is left to stand for longer than the stipulated time, it may show a false positive.

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