The Cambridge Worry Scale (CWS) is an instrument including 16 items measuring women's major worries during pregnancy. The aim of the study was to test the scale, translated into Swedish, on pregnant women in Stockholm. We also wanted to explore whether these women were worried about any item not included in the scale. An additional aim was to study possible variation in women's worries related to gestational week. Two hundred women were recruited. The average age was 31 years and 56% were primiparas. Gestational age ranged from 8 to 42 weeks, with a median of 28 weeks. The reliability of the scale was satisfactory (Cronbach's alpha coefficient 0.81). The major worries were about the baby's health, giving birth and miscarriage. These items, all related to pregnancy outcomes, were followed by worries about financial matters. An additional concern not included in the scale was about the maternity services in Stockholm, i.e. that the hospital would be overbooked, the staff being too busy or the medical safety not being guaranteed. Few women worried about their relationship with their partner or if he would be present at birth. Some of the items showed a pattern with a period of less worry in midpregnancy.