3 weeks pregnant is the closest time your situation can be confirmed. You can find everything you wonder about the third week of pregnancy below.

3 weeks pregnant overview

At 3 weeks pregnant, you probably don’t even know you’re pregnant. Symptoms don’t usually appear this early, and you haven’t yet missed a period. However, your body is starting to go into a state of preparation for your baby and some miraculous changes are taking place.

3 weeks pregnant: Your baby

Your baby is now the size of a poppy seed!

At this stage, your baby is just beginning to become an embryo. By now, your baby is medically called a zygote or blastocyst . It sounds very scientific, but it’s fascinating nonetheless.

A zygote is basically a fertilized egg and contains an equal amount of DNA from each parent. The zygote is the only cell that begins to divide and multiply to become the blastocyst , which is a larger set of cells with an outer layer and an inner layer .

The inner layer will be your baby and the outer layer will be the placenta. It takes about six days for the blastocyst to enter your uterus. Once it reaches your uterus, the blastocyst begins to embed in the uterine lining, where it becomes an embryo .

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After the blastocyst attaches to the uterus, three layers will begin to form. These are very small but can be seen under a microscope. The ectoderm layer will be your baby’s skin, hair, glands and brain.

The mesoderm layer will be your baby’s bones, muscles, blood and connective tissues. The endoderm layer will be your baby’s internal organs (heart, stomach, liver, lungs, etc.).

3 weeks pregnant: your body

From the moment of conception, your body begins to change. At this early stage of pregnancy, you probably won’t even be aware of the changes taking place in your body.

Your body is now producing higher levels of hormones to prepare to feed your baby. This increase in hormonal activity causes a few side effects that you will begin to experience in the coming weeks. These are:

  • One of the first effects of high hormone levels is breast tenderness. Your breasts may be sensitive. You may also feel them fuller and swollen. When this starts to happen, it’s a good idea to wear a supportive bra or sports bra.
  • Nausea is also a result of higher hormone levels. If you’ve never had nausea, you’re in luck. Nausea is a terrible side effect of pregnancy. What is often called ‘ morning sickness ‘ is experienced because most women experience morning sickness. For some, nausea can last all day. You must be patient. Nausea attacks usually begin to disappear after the first trimester of pregnancy. See your doctor if you have episodes of severe nausea, can’t hold food and feel dizzy when you stand up, have blood in your vomit, or only pass a small amount of urine.
  • Many women report feeling extremely tired during the first few weeks of pregnancy, including 3 weeks pregnant . This is the result of increased hormone production. To prepare for the baby, your body is now using extra resources such as blood and nutrients. You may notice your heart beating faster and working faster than usual. To combat this fatigue, make sure to get plenty of rest and incorporate light physical activity into your daily routine.
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3 weeks pregnant: Ultrasound and pregnancy test


True pregnancy only begins at the 3rd week of pregnancy. The mature egg cell containing the female genes is fertilized by the male’s semen, which creates new life. The embryo is not even a millimeter in size, and it still has a difficult task ahead: successfully burrowing in its mother’s uterine lining.

As soon as this is successful, only the amniotic cavity from the 4th week of pregnancy can be seen on the ultrasound image . Anyone who is 3 weeks pregnant should be told that there are still no signs of a fertilized egg or embryo.

Therefore, pregnancy cannot be identified using ultrasound in the case of 3 weeks of pregnancy. If you already have a doubt, you can take an early pregnancy test.

early pregnancy test

After positive fertilization in the 3rd week of pregnancy, the egg cell produces the hormone hCG and this can be measured with a urine pregnancy test available in pharmacies.

If the test is positive in the 3rd week of pregnancy , you can create good conditions for your child, eat healthy and take folic acid . Now you should avoid alcohol, nicotine and all kinds of drugs and take them only after consulting a doctor. Because any of these can harm your child and jeopardize his development from the very beginning.

However, even after a positive test at week 3 of pregnancy, it is not certain that the embryo will implant in the uterus and you will become pregnant . If the fertilized egg cell is unable to attach itself, it will remove it from the body in the next move.

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If the implantation is successful, it can be said that your pregnancy is clear. A gynecologist can identify and confirm pregnancy from the 4th week of pregnancy using a blood test and then a urine test .

Because fertilization cannot be determined exactly on a day-to-day basis, pregnancy is always calculated from the first day of the woman’s last menstrual period. The exact date of birth can be determined by the gynecologist at later examinations.

Important information about 3 weeks pregnant

  • The embryo develops from a sperm and a woman’s mature egg.
  • Successful fertilization can lead to pregnancy.
  • The first real week of pregnancy begins.
  • Pregnancy date is calculated from the first day of the last menstrual period.
  • From the 4th week of pregnancy, the doctor can confirm the pregnancy with a blood test.
  • There are no physical signs of pregnancy yet.


  • In order to strengthen the development of the embryo, you should consume enough folic acid in consultation with your doctor.
  • You should avoid using alcohol, nicotine and drugs without doctor’s approval.

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