Once you enter the fourth week of your pregnancy, the embryo has implanted itself well inside the uterus and started to grow at full pace and your body is also secreting a hormone known as hCG or human chorionic gonadotropin hormone. (doctor-info.website)
A resting blood - testosterone level is measured, followed by an injection of Gonadotropin Releasing Hormone (GnRH), and testosterone is rechecked 1 to 3 hours post injection. (riverbarkvet.com)
The vaccine is designed to include phage particles carrying multiple copies of gonadotropin releasing hormone (GnRH) peptides. (vetmed.auburn.edu)