Ovulation dates off or MC?

MrsCoachG

This is what has gone through my head everyday for the last week!  Last Thursday we went for our "6" week appt and first u/s.  They saw the sac and fetal pole but not a "baby" and heartbeat.  The Dr said I was probably just off a week or even just a few days on my ovulation calculations, to come back next thursday (tomorrow) and hopefully we will see a baby.  I'm so scared out of my mind!  We've been through two MC's already so I'm even more terrified.  Our previous MC's I was cramping and bleeding and actually lost the babies so to hear that the baby could just stop growing is just so scary to me and unexpected.  Have any of you been through this? (I assume prob more than I think).  Please tell me there are some success stories, where you went back the next week and there was a healthy baby?  I need some hope. TIA