Congrats! When you are 1 week pregnant, you may not understand the changes that your body has to go through. In week 1, you’ll mostly be experiencing the common symptoms of periods. A fertile egg released as a result of ovulation is fertilised, and will result in the formation of a zygote (the first cell of the baby’s body). You won’t experience nausea until 2 weeks after you become pregnant. However, if your pregnancy is planned, pay more attention to your lifestyle right away. Stop drinking alcohol and smoking if you do. Also, start taking folic acid and other essential vitamins to support your baby’s development during the first trimester.