An uneven appearance this soon after surgery is expected if you started with a fair amount of asymmetry. However, without an exam and without photos, it would be wrong of me to suggest that your course is normal. Give your surgeon a call and get in to see him/her as soon as possible for an exam and to help you understand your course.
Schedule an appointment with your Plastic Surgeon to discuss your breast. One breast could be more swollen than the other, but I would also ask to see a copy of the operative report to confirm the breast implant sizes used.