Some newer ultra-sensitive urine pregnancy tests claim to be able to detect HCG as early as one day after a missed period but most health experts recommend to wait at least 7 days after a missed period to get accurate results. If you just cannot wait that long, ask your doctor for a blood test.
http://www.babylifetime.com/pregnancy/how-soon-can-pregnancy-be-detected/
For example, we suggest that patients take it easy for three or four days after an insemination or embryo transfer to allow the embryo the best chance for implanting in the uterus. They can go back to work and lead their normal lives but strenuous exercise, chores and even sex should be avoided.
https://www.shadygrovefertility.com/resources/educational-resources/articles/how-early-take-pregnancy-test
The best time is after you realise that your period is late as your hormone levels will be able to be seen by the test. You can take this as soon as you realise that you may be a day late. With the new EPT test you can test 24 hours after missing your period. Minimum: 7 days.
https://answers.yahoo.com/question/index?qid=20090101103334AAkT64V
There are two types of pregnancy tests that will determine whether you should start preparing for a new member of the family or not. There are two types of blood tests. Quantitative HCG and Qualitative HCG. The good thing about a blood test is that you can take the test within 7 to 12 days of having unprotected sex. This means it is more effective than the urine test. However, the results take longer. This is because your doctor will have to take your blood sample to the laboratory for testing.
http://www.newhealthguide.org/After-How-Many-Days-Can-Pregnancy-Be-Detected.html
All in all, on average, most women test positive 13.5 days after ovulation or at the time they expect their monthly periods. Notes: Even with the above tests, the best time to have a pregnancy test is usually three weeks after you have had unprotected sex or when your periods are late.
http://www.newhealthguide.org/After-How-Many-Days-Can-Pregnancy-Be-Detected.html
This means that you probably ovulate 14 days after beginning of your last menstrual period if your menstrual cycle lasts 28 days. If the egg was fertilized by the sperm, it will travel to your uterus and implant itself in the uterine wall which takes about 6 to 12 days. At this point, your body will start producing HCG which means that a pregnancy test can detect HCG only after the implantation of the fertilized egg has occurred.
http://www.babylifetime.com/pregnancy/how-soon-can-pregnancy-be-detected/
(About 40% of women have a period never knowing they had conceived) If you DON'T want to be pregnant take a test aboout 10 days after sex (3 days before a period) as the sooner you know the sooner you can do something about it.
https://answers.yahoo.com/question/index?qid=20090101103334AAkT64V
If you're a woman trying to get pregnant on your own, don't let the months pile up for too long, especially if you are 35 or older. For women over the age of 35 see a specialist after 6 months of trying on your own and if you are over the age of 40 see a fertility specialist now.
https://www.shadygrovefertility.com/resources/educational-resources/articles/how-early-take-pregnancy-test
Also, my sister didn't show positive on pregnancy test until she was 4 months along. So go to the doc and get a blood test done if possible. Also, you can get a bfp on a test as early as 8 dpo (very rare!) but usually 12 dpo and up is when most women get a bfp. Hope this is helpful! sparkleprincess08 · 8 years ago.
https://answers.yahoo.com/question/index?qid=20090101103334AAkT64V
For example, four days before the first day of your missed period, the HPT may only be 45% accurate. The blood pregnancy test is frequently called a “beta.” That's because the test actually measures a beta chain portion of the hCG hormone molecule and is officially named a beta hCG test.
https://www.shadygrovefertility.com/resources/educational-resources/articles/how-early-take-pregnancy-test
how long after sex can pregnancy be detected
Pregnancy can be detected three weeks after sex. After a sex, pregnancy can be detected within three weeks. A Three weeks after sex can pregnancy be detected.