I had my first ultrasound on April 5th & my doc saw the yolk sac and said this was a healthy pregnancy, now I go to the doctors today which is my 8week visit and he sees a sac but no baby. Now I'm unsure of when my last menstrual cycle was so I can be wrong about how faralongI am.Butmy doc said as big as my sac is he would be able to see a baby and a heart beat, and nothing is there.I'm going to a different doc tomorrow for a second opinion. I keep seeingthis happens alot and women end up with a healthy baby. I new to knowI I have hope or if I setting myself up for more heart ache