Hi there,
Pregnancy tests are designed to detect the presence of the pregnancy hormone in your body. This hormone is called human chorionic gonadotrophin (HCG).
If you're pregnant, the amount of HCG in your body rises rapidly in the early days and weeks, and a home pregnancy test can detect this in your urine. If you are takign a home pregnancy test, it is best to use the first lot you pee in the morning as the HCG is alot more concentrated.
You may suspect that you are pregnant because you have certain symptoms, such as enlarged, or tingling breasts, nausea (feeling sick), dizziness, a metallic taste in your mouth, and a feeling that your period is about to start. However, not all women have these symptoms.
Most home pregnancy tests can be carried out from the day that your period is due. Counting the number of days from the first day of your period until the day before your next period is due to start, will give you your usual cycle length.
If your cycles are irregular, allow for your longest recent cycle length before testing. If you do not know when your next period is due, wait at least 19 days after you last had unprotected sex before testing.
If you get a negative (not pregnant) result from the pregnancy test, but you still think that you could be pregnant, wait another three days before testing again. You may have conceived later than you thought, and there was not enough HCG in your urine at that stage to be picked up by the first test.
Speak to your GP if you still get a negative result after a second test but your period has not arrived.
You can also ask your GP, or midwife, to perform a blood or urine test to confirm whether or not you are pregnant. Most surgeries will accept your positive home pregnancy test as confirmation because the tests are now as accurate as those that are used by health professionals.