Week 4 of Pregnancy: Key Developments and Changes

Baby Size at Week 4 At week 4 of pregnancy, the embryo is now about the size of a poppy seed. Despite its tiny size, this is a crucial period for development. The cells are dividing rapidly and will soon form the placenta and the baby. This is the time when the baby’s brain, spinal cord, heart, and other organs begin to form. There are approximately 36 weeks left until the due date.

Changes and State in the Mother’s Body

Your body is now starting to react to the early stages of pregnancy. The most significant change is the cessation of the menstrual period. The hormone levels, particularly hCG, are rising, which is what pregnancy tests detect. You might start experiencing some early pregnancy symptoms due to these hormonal changes.

The uterus is preparing to support the growth of your baby for the next several months. Although you might not notice any physical changes yet, your body is indeed nurturing the tiny embryo.

Common Symptoms

In week 4, some women start to notice the first signs of pregnancy, which include:

  • Missed period
  • Tender, swollen breasts
  • Nausea or vomiting, often referred to as “morning sickness”
  • Increased urination
  • Fatigue
  • Slight cramping or light spotting

Remember, every woman’s body reacts differently to pregnancy.

Tips for Week 4

  1. Exercise: Light to moderate exercise can be continued, but avoid anything too strenuous.
  2. Nutrition: Ensure your diet is rich in essential nutrients, particularly folic acid, iron, and calcium.
  3. Medical Appointments: If you have confirmed your pregnancy, it’s time to schedule your first prenatal appointment.
  4. Partner Support: Share your experiences and needs with your partner for emotional support.
  5. Family and Social Life: Start thinking about how and when you want to announce your pregnancy to family and friends.


  • What symptoms are common in week 4 of pregnancy?
    • Symptoms can include missed periods, nausea, fatigue, and breast tenderness.
  • What should I eat during week 4?
    • A nutrient-rich diet with folic acid, iron, and calcium is recommended.
  • When should I schedule my first prenatal appointment?
    • It’s advisable to schedule your first prenatal visit as soon as you confirm your pregnancy.

Disclaimer: Please note that our website is designed exclusively for entertainment purposes. Although we have confidence in our approach, we do not assert a specific accuracy rate since ongoing research continues to shape our methods.