No.
Besides the usual errors (human, technique, bad batch of reagents, etc) ...
you've also got the variation in human physiology,
and diseases which mimic pregnancy.
Pregnancy tests are not always right. Plus 3 weeks is quite a bit of time, you should go see your doctor, you will get a more accurate test.
Pregnancy can be determined by todays over the counter tests as early as 3-5 days after fetilization, which is roughly the same time as ovulation (egg release). Therefore, its a question of when the person ovulated, and not when the missed period is. Home pregnancy tests can be positive even before a missed period.
Time to speak to you most calm parent, and go see a doctor right away. It is possible to be pregnant, but only blood work will be for sure.
Pregnancy hormone likely would have been detected by this time, but due to varying sensitivities of different pregnancy tests, you could certainly be pregnant. It would be wise to try several types of home tests. The first urine of the morning has the highest concentration of pregnancy hormone. You could always go to your doctor and have a blood test to be certain.
most likely unless your a wee bigger then most of the time you should know if you wanna make sure go to your doctor or take a couple pregnancy tests!! and then you should get your answer!!
Take blood tests at the doctor and don't trust the home pregnancy tests. Then you will know for sure. Also the period messes up sometimes, especially when you are young.
Pregnancy tests, either the at-home tests or the bloodwork done at the doctor's office, measures the presence of the hormone hCG in your blood or urine. This hormone is released after conception. A home pregnancy test can detect the hormone 7-14 days after conception, depending on how sensitive the home pregnancy test is. They typically are 97-99% effective. The best time to take the test is first thing in the morning, or to wait several hours since the last time you've urinated. Drinking large amounts of water and frequent urination can cause the test to be inaccurate. Bloodwork done at the doctor's office is considered more accurate. It can detect pregnancy 7-12 days after conception.
Most test kits require the female who is being tested to urinate on a tester, wait the time required (it will be written on the box) and then the result would then appear. These types of tests are NOT 100% accurate and seeing a Doctor is the best way of testing pregnancy.
Was for me each time! Worth cking with a doctor or doing a home pregnancy test.
Go see your doctor about it. If you are throwing up, you may be pregnant.
Pregnancy tests are devices that measure the chemicals in your body. During pregnancy there is a presense of or increase in some natural chemicals, which are used to determine if you are pregnant. The pregnancy test will measure the balance of these chemicals and gives you a reading. These tests however, can have altered results based upon when you take it. I believe the best time to take a pregnancy test is 4-6 weeks after fertilization[the point when the spem meets the egg]
that depends if ur having sex and then taking the pregnancy test