I'm sorry for your previous loss. It's understandable that you're feeling concerned about the current situation. While it can be distressing to see a small gestational sac and no heartbeat at 6 weeks, it doesn't necessarily mean there is cause for alarm just yet. At this early stage of pregnancy, it can be difficult to detect a heartbeat, especially if the gestational sac is smaller than expected. However, it's important to follow up with your healthcare provider for further evaluation and guidance. They may recommend additional tests or scans to monitor the progress of your pregnancy and ensure everything is developing as expected. Remember, every pregnancy is unique, and what may have happened in the past doesn't necessarily predict the outcome of this pregnancy. Stay positive and reach out for support from your healthcare team and loved ones during this time.