A fetal heartbeat of 107 on the last day of week 6 can be considered within a normal range. While the doctor mentioned that it should ideally be around 117, there can be slight variations in heart rate at this stage. It is important to remember that every pregnancy is unique, and individual factors can influence the heart rate. If you have any concerns or doubts, it is best to consult with your healthcare provider for further evaluation and guidance. They will be able to provide personalized advice based on your specific situation and address any concerns you may have.