A 25-year-old woman is pregnant. During her first prenatal visit, a right ventricular (RV) heave is felt and there is a blowing, holosystolic murmur that is heard best at the lower left sternal border. What is the most appropriate next step for evaluation of the murmur? Obtain an echocardiogram. Obtain an echocardiogram at her next visit in six weeks. Follow her with serial examinations and see her back in clinic in four weeks. Obtain a complete blood count to evaluate for anemia. Nothing, no follow-up is required.