Hi there, my gestational sac has grown nicely and is measuring 26mm (mean sac diameter). There is a fetal pole present with a heartbeat. Yet the fetal pole has not grown for the past week and is measuring just 3.7mm. I have had no spotting or pains. My HCG level is at a good level and doubling. Heartbeat is present and has been present for the past 2 weeks. According to my own dates i should be 8 weeks. At scan 1 I had just the yolk sac present. At scan 2 fetal pole and heart pulsations were present. At scan 3 fetal pole and heartbeat was present. The scans were spaced at weekly intervals. The sac has grown 11 mm in the past week to a mean sac diameter of 27mm, and heartbeat is present, but fetal pole does not appear to have grown since last week. Is this pregnancy still viable? Help!?