5 Weeks Pregnant: Symptoms, Body Changes & Baby Development

Pregnancy is a joyous occasion in a couple’s life. However, the entire phase, from the fetus detection to the delivery, can be physically, mentally and emotionally challenging for women. Women start sensing signs of pregnancy at the start of the second month.

In this blog, discover more about the pregnancy symptoms, body changes and baby development during the 5th week of pregnancy.


The initial sign of a pregnancy is missed periods. However, during the 5th week of pregnancy, the mother-to-be goes through a couple of physical and hormonal changes. These changes become evident via the following symptoms:


It is common to experience some bleeding or spotting during the initial stages of pregnancy. This is the result of sensitive cervix and implantation, the process by which the embryo attaches to the endometrial surface of the uterus. Spotting is usually dark brown or light pink and may last up to a few hours or in some cases, even for days. 

In some cases, bleeding might be followed by cramping. It is a common phenomenon and it’s nothing to be worried about. Although, paying a visit to your gynaecologist is highly recommended during this stage to rule out any health-related risks or the possibility of a miscarriage. 


Of the many signs and symptoms during the fifth week of pregnancy, fatigue is the most common one. This is majorly due to hormonal changes and recent developments within a woman’s body. During the fifth week, the body starts taking extra efforts to support the growing life inside. 

There are many ways to find relief during this phase. The easiest solution is taking enough rest or daytime naps. Another viable solution is eating a balanced diet that includes plenty of fruits, vegetables, whole grains, and water. Regular exercise is another way to deal with constant fatigue. However, it is important to refrain from all sorts of heavy physical exertion.

Morning sickness:

A woman can go through bouts of morning sickness starting from the 5th week of her pregnancy. Even though it is called ‘morning’ sickness, a nauseated feeling and urge to vomit can happen during any time of the day. This phase is not just limited to the fifth week of pregnancy. 

A woman experiences morning sickness during the first trimester. But for some, it continues throughout the pregnancy period. Just like fatigue, morning sickness is also a common occurrence that can be followed by food aversion, dehydration, and loss of appetite. One must ensure to drink enough water and follow a balanced diet to maintain good health. 

Baby Development at 5 Weeks

Major baby developments take place after the first five weeks. The baby is now called an embryo and is as tiny as a sesame seed. At this stage, the embryo is burrowed in the uterus and is covered by the amniotic sac. Most organs start to develop in this period and the overall growth of the baby speeds up. Other major developments include:

  • The baby’s heart starts to beat after the first five weeks. The blood begins to circulate through the baby’s body as the circulatory system develops.
  • The size of the baby in this period reaches up to one-fourth of an inch.
  • The neural tube development begins and eventually vital parts like the brain, spinal cord, and nerves undergo the primary development stage via rapid cell divisions.
  • Both the lungs begin to form and the embryonic liver starts producing blood cells.
  • Gastrointestinal organs, reproductive organs, kidneys, limbs, eyes, and fingers also start developing.

This is the stage when a woman is officially pregnant. During this period the expectant mother is supposed to go through many tests to ensure her well-being and that of her baby’s. Considering a gender blood test after detection of pregnancy is ideal. Apart from identifying the sex of the baby, it also helps in detecting any chromosomal disorders.

When Should You Seek Immediate Medical Help 

If you are pregnant for over 5 weeks, the following signs warrant for an immediate visit to the doctor:  

Excessive vomiting:

There are several reasons why excessive vomiting may occur during pregnancy. It happens especially during the first trimester. One of the most common reasons for excessive vomiting is morning sickness, which is caused by fluctuations in hormone levels. Other potential causes of vomiting during pregnancy include indigestion, food poisoning, and viruses such as the stomach flu. 

During this stage, it is important to take efforts in maintaining your fluid levels. Drink plenty of water, and fruit/vegetable juice to avoid dehydration. If vomiting continues excessively, it is important to consult with your obstetrician and gynaecologist to rule out any serious underlying causes.

Severe abdominal pain:

The blissful moments of a mother-to-be during the 5th week of pregnancy are often marred by physical discomfort such as severe abdominal pain. This is quite normal when 5 weeks pregnant but one must seek medical advice should it be prolonged.

There are many possible causes of severe abdominal pain when 5 weeks pregnant. Some of the most common include:

  • Gas or bloating: 

Pregnancy can cause an increase in the production of gas in your body. This can lead to pain, bloating, and burping, which results in severe abdominal pain.

  • Constipation:

Pregnancy can also slow down the movement of food through the digestive system, leading to constipation. This can cause severe abdominal pain and cramping.

  • Urinary tract infection:

UTIs are more common during pregnancy because of the changes in the urinary system. Symptoms of a UTI include severe abdominal pain, fever, and burning when urinating.

Author’s Bio:

Dhruv Mehta is a Digital Marketing Professional who works as a brand consultant and provides solutions in the digital era. In his free time, he loves to write about healthcare & lifestyle. Follow him on Twitter or connect with him via LinkedIn.