The size of the gestational sac (GS) can vary during early pregnancy, and a measurement of 7mm at six weeks is generally within the normal range. However, it is important to note that individual variations can occur, and it is always best to consult with your healthcare provider for an accurate assessment. They will consider various factors such as your specific circumstances and any symptoms you may be experiencing. In some cases, further monitoring or additional tests may be recommended to ensure the health and progress of your pregnancy. It's essential to communicate any concerns or questions you have with your healthcare provider who can provide personalized guidance based on your unique situation.