Hi, I'm currently waiting on a viability scan. The wait is killing me. They think I'm around 6 weeks, going off measurements but couldn't find a heart beat which I know isn't uncommon this early. The bit they were concerned with was size of yolk sac. They said it looks large but didn't actually measure it. I'm working out as 4.77mm going off the CRL of 3.88mm. Does this look large, very large or normal? The clinic are so useless and have been wrong at every point. They told me 2 weeks ago I was having a missed miscarriage and came in a week later to be told it's grown and there is now a visa or fetal pole but no heartbeat and a large yolk sac so it's likely I'll miscarry. Rewind a few weeks earlier and they said I didn't ovulate, I wouldn't ovulate and I'm not responding to medication so it's the end of our journey. (Wrong again, 2 weeks after that convo I got my BFP) I keep going from devastation to complete joy to now being stuck in limbo. Please help 