Approximately every month, most sexually active women of child-bearing years could become pregnant. During ovulation, an egg is released from the ovary and makes its way to the uterus. If it is fertilized by a sperm and implants on the uterine wall, a woman is pregnant. If she is not pregnant, the lining of the uterus sheds (this is your period), and the cycle repeats.
Pregnancy tests are most accurate about one week after a missed period.
When a fertilized egg attaches itself to the uterine wall, the body begins producing a hormone called human chorionic gonadotropin, or hCG. The levels of this hormone rise rapidly in early pregnancy, almost doubling every two to three days. hCG is detectable in urine and blood, and is a sign of pregnancy.
There are different types of pregnancy tests available. Home pregnancy tests, which you can buy in drugstores, test for hCG in urine. Blood tests done in a health provider’s office don’t just test for the presence of hCG, which indicates you are pregnant, but also can tell how much hCG is present. Measuring hCG levels helps a provider determine how far along you are, if you have more than one developing embryo, or if there might be a problem with the pregnancy. Continue reading