5 Weeks Pregnant

You are 5 weeks pregnant, and your baby is now the size of an apple seed. Its circulatory system is complete, and the heart is beating. Symptoms you experience when 5 weeks pregnant may include headaches and morning sickness. If you have not already done so, you should make an appointment for your first prenatal checkup.

5 Weeks Pregnant: An Overview

By the time you are 5 weeks pregnant, a home pregnancy test will be able to confirm the pregnancy. Your baby is now called an embryo and is about the size of an apple seed. By the end of this week, it will have developed a beating heart of its own.
 
It is good idea to call your healthcare provider and make an appointment for your first prenatal checkup. Most healthcare providers schedule a first visit around week 8.
 
Your baby is now about 0.06 inches long.
 

Your Baby's Development at Week 5 of Pregnancy

Until now, the embryo has been a mass of cells; but starting at about week 5 of pregnancy, a distinct shape begins to form. A front, back, top, and bottom are now apparent. Also, a bulge in the center of the embryo develops into your baby's heart.
 
Throughout week five of pregnancy, your baby's blood vessels will complete a circuit and his or her heart will begin to beat! The motion of your baby's beating heart may be detected with an ultrasound exam. With these changes, circulation begins, making the circulatory system the first functioning organ system.
 
Other developments that usually occur when you are five weeks pregnant include the following:
 
  • The head and the tail folds become distinct
  • The three parts of the brain will emerge -- the hindbrain, midbrain, and forebrain
  • The nervous system begins to develop
  • Muscles and bones begin to develop
  • The placenta and the amniotic sac begin to develop.
     
 
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