Pregnancy from weeks 1 to 5

Women often do not become aware of any signs that they are pregnant until four weeks into their pregnancy, and most do not notice any changes at this early stage in their pregnancy. By week five, your period will be a week late.

Woman with pregnancy test

What’s happening to the mother?

During the first weeks of pregnancy, few people recognise any signs that they are pregnant. Week four is normally the time when your next period should start. If you miss this period or you experience an abnormally small amount of bleeding, this may be a sign that you are pregnant.

Some women can feel changes in their body, but most people do not notice any changes so early in their pregnancy. In week five, many people experience signs of pregnancy. It is common to feel:

  • The need to urinate frequently
  • Tender and enlarged breasts
  • Aching in the lumber region
  • Gentle pressure or swelling around the lower abdomen

Many women also experience fatigue and nausea. Most women find that any nausea disappears during pregnancy weeks 12-14. 

Development of the fetus

Fetuses at an early stage are called embryos. At the start, the fetus consists of small cells in a ball. When the fetus attaches to the uterine mucosa, this is called an embryo. The embryo is just a few millimetres long, and the lungs and early stages of the arms and legs start to develop. The spine, which has been open until now, closes up, and the first blood cells and blood vessels form. The heart is shaped like a tube.

The placenta is formed and amniotic fluid is produced.

Feel life

Tips for pregnant women on how to monitor your baby’s movements. Information in Arabic, English, Norwegian, Polish, Somali, Spanish, Tigrinya and Urdu.


Information about pregnancy, childbirth and the postnatal period in Arabic, English, Farsi, French, Norwegian, Polish, Somali, Tigrinya and Turkish aimed at immigrants and others with a short period of residence.

Content provided by The Norwegian Directorate of Health

The Norwegian Directorate of Health. Pregnancy from weeks 1 to 5. [Internet]. Oslo: The Norwegian Directorate of Health; updated Monday, March 7, 2022 [retrieved Thursday, June 13, 2024]. Available from:

Last updated Monday, March 7, 2022