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Hi all, I had an ultrasound at what we thought was 6wks, they saw two sacs, nothing in them. I came back a week later ( a very long week later!) for second u/s and they saw only one sac with baby and haertbeat inside. No second sac was found at this time and the measurements indicated that at that point i was six weeks, not seven. I am now 12 weeks, very big and VERY sick. While i am sick with all of my pregnancies for the whole nine months, this is much worse. Could I still be carrying twins if at six weeks only one sac was detected? I'd appreciate any insight. Thanks!