It is important to note that every pregnancy is unique and individual experiences may vary. At around 5 weeks 6 days gestation, it is possible not to see a yolk sac or fetal pole on an ultrasound. However, the absence of these structures does raise some concerns and could potentially indicate a miscarriage. To confirm the status of your pregnancy, your healthcare provider may recommend follow-up scans and blood tests to monitor hormone levels. It's essential to consult with your healthcare provider for further evaluation and guidance based on your specific situation. They will be able to provide you with accurate information and support throughout this process.