Pregnancy, giving birth, and being a mother are important events in a woman's lifetime. The discovery of breast cancer during pregnancy can be devastating, especially when facing the physical changes after a mastectomy as this may affect the woman's future emotional health, her role as a mother, and the mother-child bond. This report described the care provided to a woman who was diagnosed with breast cancer during pregnancy. Care was provided from November 14, 2015 to November 17. Roy's Adaptation Model of Nursing Care was used to evaluate the patient. Data were collected via observation, accompaniment, listening, and conversations. The analysis results confirmed that the patient had body image disturbance, anxiety and parental role conflict. The author provided holistic and individual care and used communication skills to encourage the patients express herfeelings and join a breast cancer support group and religious group to help restore her confidence toward body image. The patient's husband was instructed to accompany the patient to reduce anxiety and increase confidence. Healthcare providers are recommended to carefully consider the care provided to this type of patient. Physical contact between the mother and her baby and a shared hospital room environment can help quickly establish the mother-child bond and development of maternal role.