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Weekly Pregnancy Calendar

Weekly Pregnancy Calendar: A Comprehensive Guide to Your Pregnancy Journey


Pregnancy is an extraordinary journey filled with both excitement and trepidation. As your body undergoes a myriad of changes, it’s essential to stay informed about the milestones and developments that lie ahead. A weekly pregnancy calendar provides a valuable roadmap, guiding you through each stage of your pregnancy with detailed information about your baby’s growth, your body’s transformations, and the important appointments and screenings you’ll need.

Week 1-4: The Beginning of Life

  • Fertilization: During ovulation, an egg is released from one of your ovaries. If it encounters a sperm, fertilization occurs, creating a zygote.
  • Implantation: The zygote travels down the fallopian tube and implants itself in the lining of your uterus.
  • Embryonic Development: The zygote rapidly divides, forming an embryo. By the end of week 4, the embryo consists of three distinct layers that will develop into different parts of the body.

Week 5-8: Early Development

  • Embryonic Heartbeat: Around week 5, the embryo’s heart begins to beat.
  • Neural Tube Formation: The neural tube, which will eventually become the brain and spinal cord, begins to form.
  • Morning Sickness: Many women experience morning sickness during this period, which can range from mild nausea to severe vomiting.
  • Prenatal Appointments: Schedule your first prenatal appointment with your healthcare provider to confirm your pregnancy and discuss your medical history and lifestyle.

Week 9-12: Organ Development

  • Fetal Growth: The embryo is now referred to as a fetus and is about the size of a grape.
  • Organ Formation: Major organs, such as the brain, heart, lungs, and kidneys, begin to develop.
  • Limb Development: The fetus’s arms and legs begin to form.
  • Ultrasound: You may have your first ultrasound around week 12 to check the fetus’s growth and development.

Week 13-16: Rapid Growth

  • Fetal Movement: You may start to feel your baby’s first movements, known as quickening.
  • Gender Determination: If you choose to find out the baby’s gender, it can usually be determined through an ultrasound or blood test.
  • Increased Blood Volume: Your blood volume increases significantly to support the growing fetus.
  • Weight Gain: You may start to notice a gradual increase in your weight.

Week 17-20: Fetal Maturation

  • Fetal Activity: Your baby becomes more active and you may feel kicks and jabs.
  • Fetal Hearing: The fetus’s hearing develops, and it can respond to sounds.
  • Amniotic Fluid: The amount of amniotic fluid surrounding the fetus increases.
  • Prenatal Screening: You may undergo prenatal screening tests, such as the AFP test, to check for potential birth defects.

Week 21-24: Growth and Development

  • Fetal Size: The fetus is about the size of a small cantaloupe.
  • Lung Development: The fetus’s lungs begin to mature, preparing for breathing after birth.
  • Skin Development: The fetus’s skin becomes thicker and less transparent.
  • Increased Appetite: Your appetite may increase as your body needs more calories to support the growing fetus.

Week 25-28: Third Trimester Begins

  • Fetal Position: The fetus may start to turn head-down in preparation for birth.
  • Weight Gain: You may gain weight more rapidly during this trimester.
  • Frequent Urination: As the uterus grows, it puts pressure on your bladder, leading to more frequent urination.
  • Braxton Hicks Contractions: You may experience mild, irregular contractions known as Braxton Hicks contractions.

Week 29-32: Fetal Growth Spurt

  • Fetal Size: The fetus grows rapidly and is about the size of a large grapefruit.
  • Brain Development: The fetus’s brain undergoes significant development.
  • Eye Development: The fetus’s eyes open and can respond to light.
  • Prenatal Classes: Consider attending prenatal classes to learn about labor, delivery, and newborn care.

Week 33-36: Preparing for Birth

  • Fetal Position: The fetus usually settles into a head-down position.
  • Pelvic Exam: Your healthcare provider will perform a pelvic exam to check the dilation and effacement of your cervix.
  • Weight Gain: Your weight gain may slow down as the fetus prepares for birth.
  • Nesting Instinct: You may experience a strong urge to prepare your home and belongings for the baby’s arrival.

Week 37-40: The Final Stretch

  • Fetal Maturity: The fetus is fully developed and ready for birth.
  • Labor Signs: Watch for signs of labor, such as regular contractions, rupture of membranes, or bloody show.
  • Prenatal Appointments: You will have more frequent prenatal appointments to monitor your progress and prepare for labor.
  • Delivery: Most babies are born between weeks 37 and 40 of pregnancy.


The weekly pregnancy calendar provides a comprehensive overview of your pregnancy journey, from the moment of conception to the birth of your baby. By understanding the milestones and developments that lie ahead, you can make informed decisions about your health and well-being during this transformative time. Remember to consult with your healthcare provider regularly for personalized guidance and support throughout your pregnancy.

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