I've had two miscarriages in the past six months. Both times, the doctor said that the sac was empty. I've read somewhere that this could be a blighted ovum and that it's quite unusual to happen more than once. My last miscarriage was in january and i'm just waiting to see the doc again for a check up. Has anyone else suffered from this? I really don't want to go through another pregnancy if I know this could happen again.... Who knows, it could always be third time lucky!