Hi!!! I used to be a CD-rom coz i can't type Chinese. I got the same problem as you do. My last M was Mar 8 (normally irregular), last check-up on Apr 30. The sac growth to 1.8cm but can't find the heart. When the doctor said "it could like a plant without seed... let's see in 2 weeks and how it grow." C6 and I were both looking at the U/S screen and my tears were holding in my eyes.
Will have the 1st Govt Hospital checp-up on May 17am and C+ in the afternoon. Hope to have good news and can book Cannosa.. Good Luck to you too!!