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Pregnancy Development on Week 4

How is the development of the fetus at 4 weeks' gestation?

At this stage of fetal development 4 weeks of pregnancy, your baby is about the size of spinach seeds or green bean seeds, which is about 2 millimeters. Technically, the fetus you conceive can be called an embryo.

Pregnancy Development on Week 4


The embryo consists of two layers of cells that will eventually develop into all the organs and parts of your baby's body. Two other structures that are developing at this time are amnion and yolk sac.

Amnion is filled with amniotic fluid which will surround and protect the developing embryo. Yolk sac is an organ that will produce blood and help treat the embryo until the placenta takes over.

What happens to my body in the development of the fetus 4 weeks of pregnancy?

At this stage of fetal development 4 weeks, your embryo will attach to the uterus. This is called implantation or planting. After implantation, your baby starts producing a hormone called human chorionic gonadotropin (HCG) which will help maintain the uterine wall.

This hormone also sends a signal to the ovary to stop releasing eggs every month, which stops your menstruation. Some women experience slight cramps and blood spots this week during implantation, so they mistakenly think it is menstruation because these spots usually appear at the same time as the menstrual schedule.

HCG is the name of a hormone that is measured in a pregnancy test. In this 4th week, the pregnancy test is able to detect your pregnancy. HCG also causes the appearance of pregnancy symptoms that can appear this week.

You may feel tired, tingling, breast pain, and nausea. These symptoms are similar to during the menstrual period. But at the end of this week the menstrual period will not come because your pregnancy has already taken place.

What do I need to pay attention to?
You might be wondering whether the symptoms that you experience during fetal development are 4 weeks early in pregnancy. Here are some symptoms that indicate your pregnancy:

  • Pain and swelling in the breast. Many women say they feel the same pain as during menstruation, but more severe.
  • Fatigue. You may feel very tired. Increasing the concentration of the hormone progesterone can make you feel like you have run a long distance
  • Frequent urination. When you are pregnant you will find yourself going to the toilet very often.
  • Sensitive with smell. Many pregnant women often feel overwhelmed with the aroma at the beginning of the pregnancy. This may be a side effect of estrogen levels that are increasing rapidly in your body.
  • Loss of appetite. At this time you will vomit more often, not cravings. You can suddenly feel that the food you used to like becomes disgusting nowadays.
  • Nausea or vomiting. Morning sickness is usually only experienced in the first few weeks of pregnancy. However, some women have experienced nausea even before.
  • High body temperature. If your body temperature is constant high for 18 consecutive days, there is a possibility of pregnancy
  • Bleeding or blood spots. Some women experience red or reddish brown spots during their menstrual cycle. If you feel pain during bleeding, contact your doctor immediately because this can be a symptom of an ectopic pregnancy.
If you experience these symptoms, you can take a pregnancy test. A pregnancy test can be done from the first day you miss your period.

What should I discuss with the doctor?

Tell your doctor if you experience signs of pregnancy. If you have complaints about changes in your body, your doctor is the best choice to guide you. This will be the right time to check with the obstetrician who is most suitable for you. It is important to find a doctor who makes you feel comfortable.

What tests do I need to know?

The only test you need to know is test your pregnancy. Test immediately using a test pack. Pregnancy tests are confusing to read. Pregnancy tests are also not always appropriate, so it is recommended to do it several times to confirm the results. Therefore, it's a good idea to see a doctor.

Health and Safety

What do I need to know to maintain health and safety during pregnancy?
During the fetal development of 4 weeks of pregnancy, pregnant women cannot donate blood because in theory, donating blood during pregnancy can cause iron anemia. In addition, blood donors have not been proven safe for pregnant women. So blood donor organizations usually don't allow pregnant women to donate blood.

A mother who has just given birth also cannot participate in blood donation activities. Red Cross recommends that you wait six weeks after birth. After this time you can only get it give blood even when you are breastfeeding.

Most women who have children can donate red blood cells, but for some people, pregnancy can affect the ability to donate platelets.

Blood from some women has antibodies after pregnancy so that it can cause complications in patients who receive blood. Blood donor centers can test your antibodies before allowing you to donate platelets.

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