Pregnancy tests, especially early-stage home tests, are never 100% reliable.
Yes it can if you have tested too early. Here is a link for information on how pregnancy tests work: http://thefertilityshop.com/fertility/pregnancy-tests-work-a-17.html
Yes. Home pregnancy tests actually give accurate results in the first trimester, some as early as the first few weeks of pregnancy.
Some of the most sensitive tests can begin detecting the HCG hormone at levels as low as 6, or 6-7 days before your period is due.
The early detection tests say 5 days before a missed period. I personally have been able to test positive as early as 9 days past ovulation.
An ovulation predictor kit is used to help women keep track of ovulation when they are trying to conceive. Pregnancy tests are designed to predict a special hormone in the body that pregnant women have. Since an ovulation kit is not designed to detect that pregnancy hormone, it cannot be used as an early pregnancy test or any other type of pregnancy test for that matter. OPK's and pregnancy test are not designed alike, and are not meant for the same purpose.
upto 5 days before your due period, you have more chance with an internet cheapie test to detect really early as they start from detecting 10mul of hCG.
I have had two children and both times my tests didn't show I was pregnant until I was atleast 3 weeks pregnant You usually aren't supposed to take a pregnancy test until your first missed period to get the best results.
It tests the hCG (pregnancy hormone) levels that are in your blood.
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There is no real way to know until you get a positive pregnancy test. Blood tests given by dr's are usually accurate 10 to 14 after ovulation and home pregnancy tests and urine tests are usually accurate around 14 to 16 days after ovulation.
yes because to have the phantom pregnancy your body secretes pregnancy hormones which is what pregnancy tests look for