A nurse is assessing a client who has been taking oral contraceptives for the past 6 months. Which of the following findings should the nurse immediately report to the provider?

A. Weight gain 2.3 kg (5 lb): Mild weight gain can occur with oral contraceptive use and is generally not dangerous. This finding does not require immediate reporting. B. Frequent nausea: Nausea is a common side effect, especially during the first few months of therapy. While bothersome, it is usually not an urgent concern unless severe or persistent. C. Breast tenderness: Breast tenderness is a common, mild side effect of oral contraceptives and does not typically indicate a serious problem requiring immediate intervention. D. Persistent headache: A new, persistent, or severe headache can indicate vascular complications, such as hypertension or increased risk of thromboembolism, which are serious adverse effects of oral contraceptives. This finding requires immediate reporting.