Pregnancy tests are tests which detect a certain hormone called the ''human chorionic gonadotropin hormone,'' or hCG, in the urine or blood. This hormone only occurs in the body when a woman is pregnant.
There are two types of pregnancy tests: a blood test or a urine test. Urine tests are less expensive and usually more convenient because they can be done at home. All you have to do is either pee on a strip or in a cup. If you follow the directions, you should get your answer.
Blood tests are usually more reliable, and are administered by a doctor. They work the same way, by detecting hCG in the blood, which means the embryo has attached itself to the uterine wall.