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- Fetal development by week: Your baby in the womb - BabyCenter
At the start of this week, you ovulate Your egg is fertilized 12 to 24 hours later if a sperm penetrates it Over the next several days, the fertilized egg (called a zygote) will start dividing into multiple cells as it travels down the fallopian tube, enters your uterus, and starts to burrow into the uterine lining Read about fertilization
- Fetal Development: Week-by-Week Stages of Pregnancy - Cleveland Clinic
The fetal stage of development begins around the ninth week and lasts until birth This is when the embryo officially turns into a fetus The fetus gets its assigned sex around nine weeks of pregnancy, although your healthcare provider can’t detect it on ultrasound yet The fetus’s major organs and body systems continue to grow and mature
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