Islabella
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Could well be three with those numbers - but don't get your hopes up. I had a vanishing twin this pregnancy but was identical (in same sac) so different to yours. Others posted really helpfully about a week discrepancy in development not being uncommon or unheard of with fraternal and even identical twins. If that's the case, a 6mm sac a week behind your 5.5 week twins sounds bang on to me. It's a waiting game though - they saw a yolk sac, fetal pole with my little angel but it never caught up and developed a HB. I was warned by the doctors when I started TTC with only one ovary that in the months following losing one your other one often hyper ovulated to try and compensate! Xxx