So very sad...

I'm feeling very emotional and confused... I am/was 8 weeks pregnany today. We went in for an ultrasound. ( I had one at 5 weeks due to pulled back and some cramping everything measured right) and all we saw was the yolk sac... no baby. I'm devestated, I wanted this so bad. Now I have to wait to miscarry, or have a d&c... I haven't bled or spotted untill today after the transvaginal u/s.. stopped spotting and now nothing. I just want this to be over... has anybody else had a similar experience? When will I miscarry naturally? I really don't want a d&c... has this happened to anyone else and it turned out baby was hiding? ( I know, grasping at straws). I'm at a loss... :'(