Objective:Although much has been documented about the experience of breast cancer, the accounts of young women have been relatively neglected, despite that around 20% of the breast cancer diagnoses occur in women under the age of 50. In particular, the voices of young women diagnosed during pregnancy are missing from research. Breast cancer is the most common cancer associated with pregnancy, and it is diagnosed in about 1 in 3000 pregnancies.Methods:This study presents data from three women drawn from a larger study of women who had been diagnosed under the age of 45 and had completed their treatment for breast cancer. Semi-structured qualitative interviews were undertaken, with a methodology informed by social constructionist grounded theory and feminism.Results:The findings here report the ways that having breast cancer during pregnancy disrupted taken-for-granted assumptions about their pregnancies, new motherhood, and their future life course, and how this occurred within the context of gendered ideas about femininity and motherhood.Conclusions:Breast cancer during pregnancy has a far-reaching impact on young women’s lives, and women affected may need practical support in caring for young children, and counselling may be appropriate. Further research is needed in this important area.