It is generally safe to have an ultrasound at 11 weeks pregnant. This scan can provide valuable information about your baby's development, including measuring the size of the fetus, checking for any abnormalities, and confirming the due date. However, it is important to consult with your healthcare provider before scheduling the ultrasound to ensure it is necessary and appropriate for your specific situation. They will consider factors such as your medical history, any previous complications, and the purpose of the scan. Your healthcare provider will guide you on when to schedule the next ultrasound based on your individual needs.