Advice please, ladies with 6 week loss/blighted ovum experience

So I had my first sono Monday sac measures 6 weeks & was completely empty. They said it is not be a viable pregnancy & started working me up for testing etc. I went for a second opinion 4 days later, on Friday and my sac still measuring 6 weeks but not completely empty there is now a faint shadow in there where the dr said it might be my yolk sac developing but he didn't know for sure. So Monday it was completely empty & Friday there was something but they can't yet confirm it's the yolk sac. Now I had seen my yolk sac with my son at 6 weeks & the shadow looked very similar just a lot fainter & shape not as defined yet. Anybody have words of advice/experience? Thanks in advance x