Pregnancy 0, 3, 5, 7, 9 Months. ✨😍 . . Month 0 (Conception) Fertilization occurs when a sperm cell joins an egg, forming a zygote. The zygote travels down the fallopian tube and begins dividing. Month 1 (Weeks 1-4) Implantation: The embryo attaches to the uterine lining. Early pregnancy symptoms may start, such as missed periods and fatigue. Month 3 (Weeks 9-12) By the end of this month, the embryo is called a fetus. Major organs and systems begin to form. The risk of miscarriage decreases sign