I had a scan at 5w 6days. I'm pretty sure of the dates as I did ivf for unexplained infertility. There was a healthy yolk sac there but the sac measured 5w 1day. The doctor didn't seem too concerned but I had a mmc in February where exactly the same thing happened. Growing gestational sac, yolk sac but no baby ever developed. Is it possible for it to catch up and be healthy? Just wondered if anybody else has been in the same situation. I can't face the thought of another loss.