Beta human chorionic gonadotropin (hCG) is a hormone that can be used to detect pregnancy. You can call it beta hCG hormone for short!
The purpose of this hormone is to maintain the corpus luteum, which promotes the secretion of progesterone. When you become pregnant, you begin to secrete plasma beta HCG after about day 10. It peaks between weeks 7 and 12, and then gradually decreases.
Even though pregnancy tests are generally reliable, you can be sure that you are expecting by taking a beta HCG blood test in a laboratory.