Read on to discover how your twins are developing, and learn more about the pregnancy symptoms that might await you week by week. If you notice any early signs of pregnancy , a home pregnancy test might confirm that you're pregnant. Implantation bleeding.
We asked renowned medical illustrator Peg Gerrity to take us inside the womb to see how fraternal twins develop from the moment of implantation until they're ready to be born. Prenatal development: How your baby grows during pregnancy. American College of Obstetricians and Gynecologists. Multiple pregnancy. Multiple pregnancy and birth: Twins, triplets, and high-order multiples.