{"id":105,"date":"2025-10-11T17:57:09","date_gmt":"2025-10-11T14:27:09","guid":{"rendered":"https:\/\/maryamaghaei.com\/en\/?p=105"},"modified":"2025-10-11T17:57:09","modified_gmt":"2025-10-11T14:27:09","slug":"fourth-week-of-pregnancy","status":"publish","type":"post","link":"https:\/\/maryamaghaei.com\/en\/fourth-week-of-pregnancy\/","title":{"rendered":"Fourth week of pregnancy: symptoms, fetal condition, and maternal care tips"},"content":{"rendered":"

The fourth week of pregnancy is one of the most important and exciting stages of the beginning of pregnancy, because it is precisely in this week that fertilization and implantation (implantation of the embryo in the uterus) occur, and the mother’s body officially enters the gestation period. Many women are not yet aware of their pregnancy, but big changes are happening inside their bodies. From the increase in hormone levels to the beginning of the formation of a new creature in the uterus, everything is moving at a remarkable speed this week.<\/p>\n

If your period has not come on time and is a few days late, it is probably time to take a pregnancy test. At this time, the hCG hormone (pregnancy hormone) can be detected in your blood and urine, which is what makes a pregnancy test positive.<\/p>\n

In fact, the fourth week is considered the actual beginning of pregnancy; that is, when the embryo is implanted in the uterus and the mother’s body begins to nourish and protect it.<\/p>\n

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\ud83e\ude78 What exactly is happening in your body during the fourth week of pregnancy?<\/h2>\n

In the fourth week of pregnancy, the fetus is still very small, but what happens in the mother’s body and inside the uterus sets the stage for its nine months of growth and development. This week is actually the beginning of the actual pregnancy; the moment the fertilized egg implants in the uterus and pregnancy hormones begin to be secreted.<\/p>\n

Let’s take a step-by-step look at what’s happening in your body \ud83d\udc47<\/p>\n

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\ud83e\uddec Implantation<\/h3>\n

In the early days of the fourth week, the blastocyst (fertilized egg cell) enters the uterus from the fallopian tube and implants in its inner wall (endometrium).<\/p>\n

The implantation process usually occurs between days 6 and 10 after fertilization and may be accompanied by light spotting or a few drops of blood, which is completely normal.<\/p>\n

At this stage, the mother’s body begins to establish a blood connection with the fetal cells to provide the nutrients and oxygen needed for the embryo to grow.<\/p>\n

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\ud83e\ude78 Formation of the Yolk Sac and Placenta<\/h3>\n

After the embryo implants, two vital structures form:<\/p>\n

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  1. Yolk sac:<\/strong> The first source of nutrition for the embryo until the placenta forms.<\/li>\n
  2. Placenta:<\/strong> An amazing structure that will be responsible for the transfer of nutrients, oxygen, and hormones between the mother and the fetus.<\/li>\n<\/ol>\n

    At this time, the placenta is not yet complete, but it is forming and attaching to the uterine wall to fully take over the task of nourishing and supporting the fetus in the coming weeks.<\/p>\n

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    \ud83e\uddea hCG Starts to Secrete and Why Your Pregnancy Test Is Positive<\/h3>\n

    One of the most important events this week is the release of the hormone human chorionic gonadotropin (hCG) by the cells of the developing placenta. This hormone is the same substance that home pregnancy tests detect.
    \nAs hCG levels rise, your body sends messages to your ovaries to prevent the release of new eggs and to maintain the thickness of your uterine lining.<\/p>\n

    From this week on, hCG levels double approximately every 48 to 72 hours. This rapid increase is one of the signs of a healthy pregnancy and is the basis for many of the early pregnancy symptoms (such as nausea, fatigue, and breast tenderness).<\/p>\n

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    In fact, the fourth week of pregnancy is a week when everything is happening microscopically but vitally. Nothing has changed on the outside of the mother’s body yet, but inside the womb, a tiny embryo is building a new world.<\/p>\n

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    \ud83e\udd30 Signs and Symptoms of the Fourth Week of Pregnancy<\/h2>\n

    In the fourth week of pregnancy, many women are still unaware that they are pregnant, as symptoms at this stage are usually mild and similar to premenstrual symptoms. But the body is undergoing major changes, and hormones (especially hCG and progesterone) create certain symptoms that can be the first clues to pregnancy.<\/p>\n

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    \ud83c\udf3f Early Physical Symptoms in the Fourth Week of Pregnancy<\/h3>\n

    At this stage, you may experience one or more of the following symptoms:<\/p>\n