4 Weeks Pregnant

During this week, the majority of pregnant women discover they are 4 weeks pregnant. Now, if you want to know about most of your pregnancy then, you can read this article week by week.

Baby of 4 Weeks Pregnant


Your fertilised egg, known as a zygote, which is more like a ball of 32 cells, is about the size of a poppy seed. The baby is approximately 0.01 inches long and weighs approximately 0.04 oz.


Now, there are three layers in your baby’s body: ectoderm, mesoderm, and endoderm. These layers will be converted into organs and tissues.

The inner layer (ectoderm) will form the nervous system, skin, hair, nails, mammary glands, sweat glands, and enamel for the teeth.

The middle layer (mesoderm) will develop into the heart, circulatory system, skeleton, connective tissues, blood system, and muscles.

The outer layer (endoderm) will give shelter to the lungs and convert into the lining of the gastrointestinal tract, pancreas, thyroid, and liver.

Arm and leg buds will start developing during this week, even though they are not exactly clear.

Other necessary things that will develop are the amnion and the yolk sac. The amnion is filled with amniotic fluid, which collects around and shields the growing embryo.

4 Weeks Pregnant Mother

This time will probably be the week of your period. If it doesn’t happen, then it may be the first sign of your pregnancy.

What happening in the body

During this time, the embryo itself implants itself in your uterus. Some women may feel cramping and spotting, while some may not feel anything. The amniotic cavity and the placenta start forming in the body.

Human Chorionic Gonadotropin Hormone

After the implantation of the embryo, a hormone known as HCG begins to form which maintains the lining of the uterus.

This hormone also gives the signal to the ovary to stop releasing an egg per month, which happens normally.

This is the hormone that creates the symptoms of pregnancy. Tiredness, aching breasts and nausea can occur with premenstrual syndrome (PMS).

Tips for mother

  • Make sure to have healthy food.
  • Drink plenty of water each day.
  • Do regular exercise with the advice of your doctor.
  • Be careful while taking medications.
  • Be stress-free throughout pregnancy.

Symptoms for 4 Weeks Pregnant

Implantation bleeding

This is an indication that your embryo has implanted itself into the uterine wall. If you don’t have any symptoms like this, don’t worry. There is no problem at all.

PMS like symptoms

  • You may experience some hard symptoms, from bloating to mood swings and mild cramping.
  • You are now more familiar with all these symptoms and you will continue to hear about them throughout your pregnancy.


I hope that this article may contribute to your pregnancy and to get an idea about how an embryo develops in 4 Weeks Pregnant womb.

Continuing reading the articles for having updates about your beautiful journey. Visit Pregnancyweekmonth

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