I went to A&E 2 weeks ago with sharp stabbing pains in the left side of my pelvis. I was 5w 3 days at the time. I have an U/S the next day, 5w4d. Just the sac, as expected as I remember with my son having an U/S around the same time and there was nothing, just the sac. They booked me in for another U/S Tuesday, 6w 2d. The doctor said they were expecting to at least see a yolk sac, but the sac looks empty. Yet the sac is measuring 12mm which is on target for how many weeks I am and my HCG levels are at where they would expect them to be. They also found a smaller sac of 3mm, they said this is probably what they call a vanishing twin as it implanted too late to develop into a pregnancy. Anyhow, I have to go back at 7w 2d for another U/S as they think I have a blighted ovum. My friend said she had an U/S at 6 weeks and her sac was empty yet when she went back at 7 weeks there was her son and the yolk sac. I'm so worried as I don't feel pregnant and with my son I did, I knew I was pregnant before I even missed my period. I have had no bleeding what so ever and I'm just hoping that a little baba will be there next week. Has anyone ever experienced anything like this? If so what was the outcome x