Although it has been around 4 weeks, your pregnancy is still in its initial phases. Most women begin to experience the start of some early signs of pregnancy like missed periods and nausea. Week 4 is usually the time when things will start to set in motion for an amazing pregnancy journey ahead.

Pregnant Week 4 – Development, Symptoms and more

How far along are you at 4 weeks?


Although it has been around 4 weeks, your pregnancy is still in its initial phases. Most women begin to experience the start of some early signs of pregnancy like missed periods and nausea. Week 4 is usually the time when things will start to set in motion for an amazing pregnancy journey ahead.

pregnancy week 4
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Week 4

You will probably miss your period during week 4. If you have, then you might be wondering it is because you are pregnant? Most certainly yes. The embryo has completed its journey through the fallopian tube and its multiplying in cell growth. The cells are still on a growth spurt, settled in your uterus and working hard to inhabit the lining of the uterus.

Baby Development at Week 4

Once the cells make a strong connection with the lining, it is going to stay and grow there for the next eight months. These cells will be breaking into two groups; half will your baby and the rest will be formed into the placenta. The placenta carries your baby throughout your pregnancy. It channels the nutrients to the baby and carries away the waste till your baby is born.

FYI: After you push your baby out on the day of the delivery, you will also have to push out the placenta.

Before the amniotic sac starts to form around the embryo, a smaller temporary sack is formed called as yolk sac. This yolk sac will later become the digestive tract of the developing baby.

The embryo is as tiny as a poppy seed but it still has developed a set of three essential cells.

  1. The Ectoderm. It will develop into the baby’s skin, brain, nervous system, and other external tissues as it is the most exterior germ layer.
  2. The Endoderm: It will become the lining of the gut and other internal organs like the liver, thyroid, pancreas as it is the most internal germ layer.
  3. The Mesoderm: As the middle germ layer, it forms the baby’s skeleton system, blood circulatory system, muscles, urogenital organs, and connective tissues.

Your body: Week 4

Four-week pregnancy is still very early to notice a change in your body. You still might be wondering if you are pregnant as your pregnancy test may not show a positive result. The human chorionic gonadotropin (hCG) levels in your urine are still below 25 mIU

After six to twelve days after the egg gets fertilized, the embryo begins to release the hCG hormone. It is the pregnancy hormone that will show on your pregnancy test when a single lines turn into a double or a positive sign.

Once hCG levels increase, it alerts the follicle which hosted the egg to develop, ovulate and rupture to stay active and produce two other pregnancy hormones; the progesterone and estrogen. Until the placenta is formed by the cells, the combination of these hormones nourishes the pregnancy till about week 8.

Some women might begin to experience the much talked about early signs of pregnancy and some don’t feel a thing. Common signs are morning sickness, bloating, mood swings, tender breasts, etc. Implantation bleeding is also one of the main early signs of pregnancy that almost 25 percent of women experience.

Calculate your due date

Seems a bit confusing, but calculating your due date is not that hard. Here are few points to consider:

  1. Remember the first day of your last menstruation cycle.
  2. It will be best to remember how many days your menstruation cycle last or after how many days your period returns. Most cycle lengths are 21 days
  3. The sperms can stay in your body for up to six days which means that the day of the intercourse does not usually count for the day of the conception.
  4. You won’t even notice any change in your body for the first 4 weeks until you miss your period and the hCG levels grow which ultimately results in a positive pregnancy test.
  5. You are already 4 weeks pregnant by the time your pregnancy test comes positive.
  6. Your ideal due date will be between 38 to 42 weeks

The common due date thumb rule is 40 weeks from the first day of your last menstruation cycle.

So just take the first day of your last period and calculate 40 weeks from that day. You will have your probable due date. Let’s say that your last period started on 1 January 2020, your due date will be the 30th of September 2020.

Only 5 percent of the babies are born on their exact due date. So do not depend on your due date. Your baby may come early as 38 weeks or as late as 42 weeks.

Fun fact: Your organs will shift around to make space for your growing baby. The uterus needs a lot of space as it expands from the size of an orange pre-pregnancy to a size of a large watermelon by the end of the pregnancy. The uterus which hosts your baby can grow up to 500 times during your pregnancy.

When to call a doctor

Alert your doctor or ob-gyn if your experience heavy bleeding, fever, severe pelvic cramps, shoulder pains accompanied by chills or dizziness.

Also, let your doctor know if you suffer pain or burn when urinating. The doctor will check for Urinary Tract Infections (UTIs).