Presence of Human chorionic gonadotrophin (HCG) hormone confirms pregnancy in woman. A home pregnancy test detects the presence of hCG hormone in the urine. This hormone is secreted at a certain time in the uterus. According to medical research, normally this hormone releases after six days of fertilization. Level of this hormone gradually increases in the woman’s body after fertilization. It is really great that home pregnancy tests are able to identify the presence of this hormone only after first missed menstruation cycle. Level of this hormone becomes very high between second and third month of pregnancy.