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Like ovulation tests, pregnancy tests also work detecting the presence of a certain hormone in your urine. When a fertilized egg implants in your uterus lining, membranes surrounding the tiny embryo begin secreting Human Chorionic Gonadotrophin (HCG) into your blood. This hormone can be detected in your urine about 7 to 14 days after fertilization. HCG levels peak at the second month of pregnancy, then decline. Although low, this level remains steady until birth.
Some pregnancy tests are sensitive enough to pick up a trace of HCG before your period is due. You will see that concentrations of HCG are reported in milli-International Units (mIU) per milliliter. A test with a sensitivity of 20 mIU/ml is more sensitive than one with a sensitivity of 50 mIU/ml.
These pregnancy tests have two chemical pads, one to show qualitatively the HCG present in your urine and a control line to show if the test worked properly. When the test line appears, even though it is the most fade of lines, it means that you are pregnant.
First morning urine is the best time to collect a sample for pregnancy tests.
20mIU/hCG tests offer increased sensitivity and a capacity to detect a positive result earlier. This means that you can begin testing at approximately 7 to 10 days past ovulation. Nevertheless, a negative within this time frame does not necessarily indicate you are absolutely not pregnant.
It is very easy to get them online. Amazon is a supplier that sells different brands of test in different batch sizes to numerous countries. There you can choose the product that you like.