To get closest to the right answer, wait over a month. If you have a lot of money to throw away, you can just keep taking the tests or buy a massive expensive one that supposably can tell you after 28 hours. Just read what is written on the package.
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Well a pregnancy test can detect hCG (pregnancy hormones) levels as far as 5 days before your expected period. Though it is not particularly accurate. I personally recommend taking the test 1-2 days before your expected period for best accuracy. A pregnacny test cannot really tell you how far a long you are. If you think you may be pregnant, and possibly have been for a little while you could have suspected your implantation bleeding (or other reasons for bleeding during pregnancy) for you period. To know how far a long you are you should contact your OB/GYN. Here is a link to a website that will calculate the probability of your pregnancy: http://www.thepregnancytest.com/
Most women will test positive on a home pregnancy test around the 5 to 7 weeks point.Remember that all women are different and that different tests have different levels of sensitivity.For best results test as soon as you wake up as that urine has the most amount of hormones.
Well conception is about 5-7 days after intercourse. Some home pregnancy tests can tell (though there percentage of accuracy is very low) up to 5 days before your missed period.
About a month, usually you are able to take a test and have it be 99% effective right around when you would have missed your period.